@webcomponents/shadydom - npm Package Compare versions

Comparing version 1.8.0 to 1.9.0

CHANGELOG.md

@@ -8,4 +8,15 @@ # Changelog
 
-<!-- ## [Unreleased] -->
+<!-- ## Unreleased -->
 
+## [1.9.0] - 2021-08-02
+
+- Add `@this` annotation to new `elementFromPoint` wrappers.
+  ([#464]https://github.com/webcomponents/polyfills/pull/464)
+- Adds `element(s)FromPoint` to `document` and `shadowRoot`
+  ([#463]https://github.com/webcomponents/polyfills/pull/463)
+- Add TS externs. ([#457](https://github.com/webcomponents/polyfills/pull/457))
+- When `EventTarget.prototype` exists but is not in the prototype chain of
+  `window`, polyfill installation breaks.
+  ([#416](https://github.com/webcomponents/polyfills/pull/416))
+
 ## [1.8.0] - 2020-10-21
@@ -12,0 +23,0 @@

externs/shadydom.js

@@ -9,7 +9,7 @@ /**
  * prevent conflicts with other closure-compiler code.
- * @type {Object}
+ * @type {!Object|undefined}
  */
 EventTarget.prototype.__handlers;
 
-/** @type {Object} */
+/** @type {!Object|undefined} */
 Node.prototype.__shady;
@@ -26,3 +26,3 @@
 // blur).
-IWrapper.prototype.focus = function() {};
+IWrapper.prototype.focus = function () {};
 
@@ -47,3 +47,3 @@ /** @type {!boolean|undefined} */
  */
-ShadowRoot.prototype._renderSelf = function(){};
+ShadowRoot.prototype._renderSelf = function () {};
 
@@ -50,0 +50,0 @@ // Prevent renaming of properties used by Polymer templates with

package.json

 {
   "name": "@webcomponents/shadydom",
-  "version": "1.8.0",
+  "version": "1.9.0",
+  "publishConfig": {
+    "access": "public"
+  },
   "description": "Shadow DOM polyfill",
-  "main": "shadydom.min.js",
+  "license": "BSD-3-Clause",
   "repository": {
@@ -11,6 +14,22 @@ "type": "git",
   },
+  "author": "The Polymer Project Authors (https://polymer.github.io/AUTHORS.txt)",
+  "homepage": "https://github.com/webcomponents/polyfills/tree/master/packages/shadydom",
   "bugs": "https://github.com/webcomponents/polyfills/issues?q=is%3Aissue+is%3Aopen+label%3A\"Package%3A+shadydom\"",
-  "homepage": "https://github.com/webcomponents/polyfills/tree/master/packages/shadydom",
-  "author": "The Polymer Project Authors (https://polymer.github.io/AUTHORS.txt)",
-  "license": "BSD-3-Clause",
+  "main": "shadydom.min.js",
+  "scripts": {
+    "build": "gulp",
+    "build:watch": "chokidar --initial 'src/**/*.js' -c 'npm run build'",
+    "debug": "rollup -c",
+    "prepack": "npm run build",
+    "regen-package-lock": "rm -rf node_modules package-lock.json; npm install"
+  },
+  "files": [
+    "CHANGELOG.md",
+    "externs/**/*.d.ts",
+    "externs/**/*.js",
+    "LICENSE.md",
+    "shadydom.min.js*",
+    "src/**/*.js",
+    "README.md"
+  ],
   "keywords": [
@@ -26,21 +45,3 @@ "shady-dom",
   ],
-  "scripts": {
-    "build": "gulp",
-    "build:watch": "chokidar --initial 'src/**/*.js' -c 'npm run build'",
-    "debug": "rollup -c",
-    "lint": "eslint src",
-    "regen-package-lock": "rm -rf node_modules package-lock.json; npm install",
-    "prepack": "npm run build"
-  },
-  "files": [
-    "shadydom.min.js*",
-    "src/**/*.js",
-    "externs/**/*.js",
-    "LICENSE.md",
-    "README.md"
-  ],
-  "publishConfig": {
-    "access": "public"
-  },
-  "gitHead": "2f9e4c15853a7963e99e886e053f2483459f4407"
+  "gitHead": "966c28a79fcd46dedc4367be6b93404565ab9cf6"
 }

README.md

@@ -24,3 +24,2 @@ # ShadyDOM
 </script>
-
 ```
@@ -31,2 +30,3 @@
 For building and testing, first run
+
 ```
@@ -39,3 +39,2 @@ npm install
 
-
 ## Limitations
@@ -47,4 +46,4 @@
 
-ShadowDOM compatible styling is *not* provided with the ShadyDOM shim. To
-shim ShadowDOM styling, use the [shadycss](https://github.com/webcomponents/shadycss) shim.
+ShadowDOM compatible styling is _not_ provided with the ShadyDOM shim. To
+shim ShadowDOM styling, use the [shadycss](https://github.com/webcomponents/polyfills/tree/master/packages/shadycss) shim.
 
@@ -51,0 +50,0 @@ On very old versions of Chrome and Safari, in rare cases `ShadyDOM.patch(node)`

shadydom.min.js

@@ -10,44 +10,58 @@ (function(){/*
 */
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+n.focus=function(){this.node.__shady_native_focus()};n.blur=function(){this.node.__shady_blur()};n.importNode=function(a,b){if(this.node.nodeType===Node.DOCUMENT_NODE)return this.node.__shady_importNode(a,b)};n.getElementById=function(a){if(this.node.nodeType===Node.DOCUMENT_NODE)return this.node.__shady_getElementById(a)};n.elementsFromPoint=function(a,b){return this.node.__shady_elementsFromPoint(a,b)};n.elementFromPoint=function(a,b){return this.node.__shady_elementFromPoint(a,b)};
+n.querySelector=function(a){return this.node.__shady_querySelector(a)};n.querySelectorAll=function(a,b){return this.node.__shady_querySelectorAll(a,b)};n.assignedNodes=function(a){if("slot"===this.node.localName)return this.node.__shady_assignedNodes(a)};n.append=function(a){for(var b=[],c=0;c<arguments.length;++c)b[c]=arguments[c];return this.node.__shady_append.apply(this.node,p(b))};
+n.prepend=function(a){for(var b=[],c=0;c<arguments.length;++c)b[c]=arguments[c];return this.node.__shady_prepend.apply(this.node,p(b))};n.after=function(a){for(var b=[],c=0;c<arguments.length;++c)b[c]=arguments[c];return this.node.__shady_after.apply(this.node,p(b))};n.before=function(a){for(var b=[],c=0;c<arguments.length;++c)b[c]=arguments[c];return this.node.__shady_before.apply(this.node,p(b))};n.remove=function(){return this.node.__shady_remove()};
+n.replaceWith=function(a){for(var b=[],c=0;c<arguments.length;++c)b[c]=arguments[c];return this.node.__shady_replaceWith.apply(this.node,p(b))};
+da.Object.defineProperties(Z.prototype,{activeElement:{configurable:!0,enumerable:!0,get:function(){if(w(this.node)||this.node.nodeType===Node.DOCUMENT_NODE)return this.node.__shady_activeElement}},_activeElement:{configurable:!0,enumerable:!0,get:function(){return this.activeElement}},host:{configurable:!0,enumerable:!0,get:function(){if(w(this.node))return this.node.host}},parentNode:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_parentNode}},firstChild:{configurable:!0,
 enumerable:!0,get:function(){return this.node.__shady_firstChild}},lastChild:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_lastChild}},nextSibling:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_nextSibling}},previousSibling:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_previousSibling}},childNodes:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_childNodes}},parentElement:{configurable:!0,enumerable:!0,
 get:function(){return this.node.__shady_parentElement}},firstElementChild:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_firstElementChild}},lastElementChild:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_lastElementChild}},nextElementSibling:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_nextElementSibling}},previousElementSibling:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_previousElementSibling}},
 children:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_children}},childElementCount:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_childElementCount}},shadowRoot:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_shadowRoot}},assignedSlot:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_assignedSlot}},isConnected:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_isConnected}},innerHTML:{configurable:!0,
-enumerable:!0,get:function(){return this.node.__shady_innerHTML},set:function(a){this.node.__shady_innerHTML=a}},textContent:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_textContent},set:function(a){this.node.__shady_textContent=a}},slot:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_slot},set:function(a){this.node.__shady_slot=a}},className:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_className},set:function(a){return this.node.__shady_className=
-a}}});function Kc(a){Object.defineProperty(Z.prototype,a,{get:function(){return this.node["__shady_"+a]},set:function(b){this.node["__shady_"+a]=b},configurable:!0})}db.forEach(function(a){return Kc(a)});eb.forEach(function(a){return Kc(a)});var Lc=new WeakMap;function Mc(a){if(x(a)||a instanceof Z)return a;var b=Lc.get(a);b||(b=new Z(a),Lc.set(a,b));return b};if(v.F){var Nc=v.c?function(a){return a}:function(a){Fa(a);Ea(a);return a};window.ShadyDOM={inUse:v.F,patch:Nc,isShadyRoot:x,enqueue:ya,flush:F,flushInitial:function(a){!a.H&&a.j&&N(a)},settings:v,filterMutations:Ac,observeChildren:yc,unobserveChildren:zc,deferConnectionCallbacks:v.deferConnectionCallbacks,preferPerformance:v.preferPerformance,handlesDynamicScoping:!0,wrap:v.g?Mc:Nc,wrapIfNeeded:!0===v.g?Mc:function(a){return a},Wrapper:Z,composedPath:Ma,noPatch:v.g,patchOnDemand:v.G,nativeMethods:Cc,
-nativeTree:Dc,patchElementProto:hc};Jc();gc("__shady_");Object.defineProperty(document,"_activeElement",bc.activeElement);A(Window.prototype,ec,"__shady_");v.g?v.G&&A(Element.prototype,Pb):(gc(),cb());Ya();window.Event=$a;window.CustomEvent=ab;window.MouseEvent=bb;window.ShadowRoot=Nb};}).call(this);
+enumerable:!0,get:function(){return this.node.__shady_innerHTML},set:function(a){this.node.__shady_innerHTML=a}},textContent:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_textContent},set:function(a){this.node.__shady_textContent=a}},slot:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_slot},set:function(a){this.node.__shady_slot=a}},className:{configurable:!0,enumerable:!0,get:function(){return this.node.__shady_className},set:function(a){this.node.__shady_className=
+a}}});function Pc(a){Object.defineProperty(Z.prototype,a,{get:function(){return this.node["__shady_"+a]},set:function(b){this.node["__shady_"+a]=b},configurable:!0})}xb.forEach(function(a){return Pc(a)});yb.forEach(function(a){return Pc(a)});var Qc=new WeakMap;function Rc(a){if(w(a)||a instanceof Z)return a;var b=Qc.get(a);b||(b=new Z(a),Qc.set(a,b));return b};if(u.K){var Sc=u.i?function(a){return a}:function(a){Za(a);Ya(a);return a};window.ShadyDOM={inUse:u.K,patch:Sc,isShadyRoot:w,enqueue:ya,flush:E,flushInitial:function(a){!a.M&&a.s&&Ub(a)},settings:u,filterMutations:Da,observeChildren:Ba,unobserveChildren:Ca,deferConnectionCallbacks:u.deferConnectionCallbacks,preferPerformance:u.preferPerformance,handlesDynamicScoping:!0,wrap:u.l?Rc:Sc,wrapIfNeeded:!0===u.l?Rc:function(a){return a},Wrapper:Z,composedPath:fb,noPatch:u.l,patchOnDemand:u.L,nativeMethods:La,
+nativeTree:Ma,patchElementProto:zc};Sa();yc("__shady_");Object.defineProperty(document,"_activeElement",tc.activeElement);z(Window.prototype,wc,"__shady_");u.l?u.L&&z(Element.prototype,kc):(yc(),wb());rb();window.Event=tb;window.CustomEvent=ub;window.MouseEvent=vb;window.ShadowRoot=ic};}).call(this);
 
 //# sourceMappingURL=shadydom.min.js.map

src/array-splice.js

@@ -15,3 +15,3 @@ /**
     removed: removed,
-    addedCount: addedCount
+    addedCount: addedCount,
   };
@@ -36,4 +36,10 @@ }
 // leaves the substring '123' intact.
-function calcEditDistances(current, currentStart, currentEnd,
-                            old, oldStart, oldEnd) {
+function calcEditDistances(
+  current,
+  currentStart,
+  currentEnd,
+  old,
+  oldStart,
+  oldEnd
+) {
   // "Deletion" columns
@@ -51,10 +57,11 @@ let rowCount = oldEnd - oldStart + 1;
   // Initialize null row
-  for (let j = 0; j < columnCount; j++)
+  for (let j = 0; j < columnCount; j++) {
     distances[0][j] = j;
+  }
 
   for (let i = 1; i < rowCount; i++) {
     for (let j = 1; j < columnCount; j++) {
-      if (equals(current[currentStart + j - 1], old[oldStart + i - 1]))
+      if (equals(current[currentStart + j - 1], old[oldStart + i - 1])) {
         distances[i][j] = distances[i - 1][j - 1];
-      else {
+      } else {
         let north = distances[i - 1][j] + 1;
@@ -94,6 +101,7 @@ let west = distances[i][j - 1] + 1;
     let min;
-    if (west < north)
+    if (west < north) {
       min = west < northWest ? west : northWest;
-    else
+    } else {
       min = north < northWest ? north : northWest;
+    }
 
@@ -148,4 +156,3 @@ if (min == northWest) {
  */
-function calcSplices(current, currentStart, currentEnd,
-                      old, oldStart, oldEnd) {
+function calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd) {
   let prefixCount = 0;
@@ -156,7 +163,9 @@ let suffixCount = 0;
   let minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);
-  if (currentStart == 0 && oldStart == 0)
+  if (currentStart == 0 && oldStart == 0) {
     prefixCount = sharedPrefix(current, old, minLength);
+  }
 
-  if (currentEnd == current.length && oldEnd == old.length)
+  if (currentEnd == current.length && oldEnd == old.length) {
     suffixCount = sharedSuffix(current, old, minLength - prefixCount);
+  }
 
@@ -168,17 +177,20 @@ currentStart += prefixCount;
 
-  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)
+  if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0) {
     return [];
+  }
 
   if (currentStart == currentEnd) {
     splice = newSplice(currentStart, [], 0);
-    while (oldStart < oldEnd)
+    while (oldStart < oldEnd) {
       splice.removed.push(old[oldStart++]);
+    }
 
-    return [ splice ];
-  } else if (oldStart == oldEnd)
-    return [ newSplice(currentStart, [], currentEnd - currentStart) ];
+    return [splice];
+  } else if (oldStart == oldEnd) {
+    return [newSplice(currentStart, [], currentEnd - currentStart)];
+  }
 
   let ops = spliceOperationsFromEditDistances(
-      calcEditDistances(current, currentStart, currentEnd,
-                             old, oldStart, oldEnd));
+    calcEditDistances(current, currentStart, currentEnd, old, oldStart, oldEnd)
+  );
 
@@ -190,3 +202,3 @@ splice = undefined;
   for (let i = 0; i < ops.length; i++) {
-    switch(ops[i]) {
+    switch (ops[i]) {
       case EDIT_LEAVE:
@@ -202,4 +214,5 @@ if (splice) {
       case EDIT_UPDATE:
-        if (!splice)
+        if (!splice) {
           splice = newSplice(index, [], 0);
+        }
 
@@ -213,4 +226,5 @@ splice.addedCount++;
       case EDIT_ADD:
-        if (!splice)
+        if (!splice) {
           splice = newSplice(index, [], 0);
+        }
 
@@ -221,4 +235,5 @@ splice.addedCount++;
       case EDIT_DELETE:
-        if (!splice)
+        if (!splice) {
           splice = newSplice(index, [], 0);
+        }
 
@@ -238,5 +253,7 @@ splice.removed.push(old[oldIndex]);
 function sharedPrefix(current, old, searchLength) {
-  for (let i = 0; i < searchLength; i++)
-    if (!equals(current[i], old[i]))
+  for (let i = 0; i < searchLength; i++) {
+    if (!equals(current[i], old[i])) {
       return i;
+    }
+  }
   return searchLength;
@@ -249,4 +266,5 @@ }
   let count = 0;
-  while (count < searchLength && equals(current[--index1], old[--index2]))
+  while (count < searchLength && equals(current[--index1], old[--index2])) {
     count++;
+  }
 
@@ -261,5 +279,3 @@ return count;
 export function calculateSplices(current, previous) {
-  return calcSplices(current, 0, current.length, previous, 0,
-                          previous.length);
+  return calcSplices(current, 0, current.length, previous, 0, previous.length);
 }
-

src/attach-shadow.js

@@ -28,3 +28,5 @@ /**
 
-let isRendering = utils.settings['deferConnectionCallbacks'] && document.readyState === 'loading';
+let isRendering =
+  utils.settings['deferConnectionCallbacks'] &&
+  document.readyState === 'loading';
 let rootRendered;
@@ -44,3 +46,2 @@
 class ShadyRoot {
-
   constructor(token, host, options) {
@@ -75,5 +76,3 @@ if (token !== ShadyRootConstructionToken) {
     const rootData = ensureShadyDataForNode(this);
-    rootData.firstChild = rootData.lastChild =
-        rootData.parentNode = rootData.nextSibling =
-        rootData.previousSibling = null;
+    rootData.firstChild = rootData.lastChild = rootData.parentNode = rootData.nextSibling = rootData.previousSibling = null;
     // NOTE: optimization flag, only require an asynchronous render
@@ -155,6 +154,12 @@ // to record parsed children if flag is not set.
     if (!utils.settings['preferPerformance'] && !this._hasRendered) {
-      for (let n=this.host[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
+      for (
+        let n = this.host[utils.SHADY_PREFIX + 'firstChild'];
+        n;
+        n = n[utils.SHADY_PREFIX + 'nextSibling']
+      ) {
         const data = shadyDataForNode(n);
-        if (n[utils.NATIVE_PREFIX + 'parentNode'] === this.host &&
-            (n.localName === 'slot' || !data.assignedSlot)) {
+        if (
+          n[utils.NATIVE_PREFIX + 'parentNode'] === this.host &&
+          (n.localName === 'slot' || !data.assignedSlot)
+        ) {
           this.host[utils.NATIVE_PREFIX + 'removeChild'](n);
@@ -174,3 +179,3 @@ }
     // capture # of previously assigned nodes to help determine if dirty.
-    for (let i=0, slot; i < this._slotList.length; i++) {
+    for (let i = 0, slot; i < this._slotList.length; i++) {
       slot = this._slotList[i];
@@ -180,7 +185,11 @@ this._clearSlotAssignedNodes(slot);
     // distribute host children.
-    for (let n=this.host[utils.SHADY_PREFIX + 'firstChild']; n; n=n[utils.SHADY_PREFIX + 'nextSibling']) {
+    for (
+      let n = this.host[utils.SHADY_PREFIX + 'firstChild'];
+      n;
+      n = n[utils.SHADY_PREFIX + 'nextSibling']
+    ) {
       this._distributeNodeToSlot(n);
     }
     // fallback content, slotchange, and dirty roots
-    for (let i=0; i < this._slotList.length; i++) {
+    for (let i = 0; i < this._slotList.length; i++) {
       const slot = this._slotList[i];
@@ -190,16 +199,27 @@ const slotData = shadyDataForNode(slot);
       if (!slotData.assignedNodes.length) {
-        for (let n=slot[utils.SHADY_PREFIX + 'firstChild']; n; n=n[utils.SHADY_PREFIX + 'nextSibling']) {
+        for (
+          let n = slot[utils.SHADY_PREFIX + 'firstChild'];
+          n;
+          n = n[utils.SHADY_PREFIX + 'nextSibling']
+        ) {
           this._distributeNodeToSlot(n, slot);
         }
       }
-      const slotParentData = shadyDataForNode(slot[utils.SHADY_PREFIX + 'parentNode']);
+      const slotParentData = shadyDataForNode(
+        slot[utils.SHADY_PREFIX + 'parentNode']
+      );
       const slotParentRoot = slotParentData && slotParentData.root;
-      if (slotParentRoot && (slotParentRoot._hasInsertionPoint() || slotParentRoot._renderPending)) {
+      if (
+        slotParentRoot &&
+        (slotParentRoot._hasInsertionPoint() || slotParentRoot._renderPending)
+      ) {
         slotParentRoot._renderSelf();
       }
-      this._addAssignedToFlattenedNodes(slotData.flattenedNodes,
-        slotData.assignedNodes);
+      this._addAssignedToFlattenedNodes(
+        slotData.flattenedNodes,
+        slotData.assignedNodes
+      );
       let prevAssignedNodes = slotData._previouslyAssignedNodes;
       if (prevAssignedNodes) {
-        for (let i=0; i < prevAssignedNodes.length; i++) {
+        for (let i = 0; i < prevAssignedNodes.length; i++) {
           shadyDataForNode(prevAssignedNodes[i])._prevAssignedSlot = null;
@@ -274,3 +294,3 @@ }
     if (n$) {
-      for (let i=0; i < n$.length; i++) {
+      for (let i = 0; i < n$.length; i++) {
         let n = shadyDataForNode(n$[i]);
@@ -289,3 +309,3 @@ n._prevAssignedSlot = n.assignedSlot;
   _addAssignedToFlattenedNodes(flattened, assigned) {
-    for (let i=0, n; (i<assigned.length) && (n=assigned[i]); i++) {
+    for (let i = 0, n; i < assigned.length && (n = assigned[i]); i++) {
       if (n.localName == 'slot') {
@@ -321,3 +341,3 @@ const nestedAssigned = shadyDataForNode(n).assignedNodes;
     let composeList = [];
-    for (let i=0; i < slots.length; i++) {
+    for (let i = 0; i < slots.length; i++) {
       const parent = slots[i][utils.SHADY_PREFIX + 'parentNode'];
@@ -331,8 +351,7 @@ /* compose node only if:
       const parentData = shadyDataForNode(parent);
-      if (!(parentData && parentData.root) &&
-        composeList.indexOf(parent) < 0) {
+      if (!(parentData && parentData.root) && composeList.indexOf(parent) < 0) {
         composeList.push(parent);
       }
     }
-    for (let i=0; i < composeList.length; i++) {
+    for (let i = 0; i < composeList.length; i++) {
       const node = composeList[i];
@@ -347,3 +366,7 @@ const targetNode = node === this ? this.host : node;
     let children = [];
-    for (let n=node[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
+    for (
+      let n = node[utils.SHADY_PREFIX + 'firstChild'];
+      n;
+      n = n[utils.SHADY_PREFIX + 'nextSibling']
+    ) {
       // Note: if we see a slot here, the nodes are guaranteed to need to be
@@ -356,3 +379,3 @@ // composed here. This is because if there is redistribution, it has
           let distributedNode = flattenedNodes[j];
-            children.push(distributedNode);
+          children.push(distributedNode);
         }
@@ -367,4 +390,4 @@ } else {
   _isInsertionPoint(node) {
-      return node.localName == 'slot';
-    }
+    return node.localName == 'slot';
+  }
 
@@ -376,4 +399,4 @@ // Ensures that the rendered node list inside `container` is `children`.
     // process removals
-    for (let i=0, d=0, s; (i<splices.length) && (s=splices[i]); i++) {
-      for (let j=0, n; (j < s.removed.length) && (n=s.removed[j]); j++) {
+    for (let i = 0, d = 0, s; i < splices.length && (s = splices[i]); i++) {
+      for (let j = 0, n; j < s.removed.length && (n = s.removed[j]); j++) {
         // check if the node is still where we expect it is before trying
@@ -392,5 +415,6 @@ // to remove it; this can happen if we move a node and
     // process adds
-    for (let i=0, s, next; (i<splices.length) && (s=splices[i]); i++) { //eslint-disable-line no-redeclare
+    for (let i = 0, s, next; i < splices.length && (s = splices[i]); i++) {
+      // eslint-disable-line no-redeclare
       next = composed[s.index];
-      for (let j=s.index, n; j < s.index + s.addedCount; j++) {
+      for (let j = s.index, n; j < s.index + s.addedCount; j++) {
         n = children[j];
@@ -427,3 +451,3 @@ container[utils.NATIVE_PREFIX + 'insertBefore'](n, next);
     let slotNamesToSort;
-    for (let i=0; i < slots.length; i++) {
+    for (let i = 0; i < slots.length; i++) {
       const slot = slots[i];
@@ -439,3 +463,4 @@ // ensure insertionPoints's and their parents have logical dom info.
       const slotParentData = shadyDataForNode(slotParent);
-      slotParentData.__childSlotCount = (slotParentData.__childSlotCount || 0) + 1;
+      slotParentData.__childSlotCount =
+        (slotParentData.__childSlotCount || 0) + 1;
       let name = this._nameForSlot(slot);
@@ -475,3 +500,3 @@ if (this._slotMap[name]) {
       let listB = ancestorList(b);
-      for (var i=0; i < listA.length; i++) {
+      for (var i = 0; i < listA.length; i++) {
         let nA = listA[i];
@@ -501,3 +526,3 @@ let nB = listB[i];
       const slots = map[n];
-      for (let i=0; i < slots.length; i++) {
+      for (let i = 0; i < slots.length; i++) {
         const slot = slots[i];
@@ -509,3 +534,5 @@ if (utils.contains(container, slot)) {
             this._slotList.splice(x, 1);
-            const slotParentData = shadyDataForNode(slot[utils.SHADY_PREFIX + 'parentNode']);
+            const slotParentData = shadyDataForNode(
+              slot[utils.SHADY_PREFIX + 'parentNode']
+            );
             if (slotParentData && slotParentData.__childSlotCount) {
@@ -553,3 +580,3 @@ slotParentData.__childSlotCount--;
     if (n$) {
-      for (let i=0; i<n$.length; i++) {
+      for (let i = 0; i < n$.length; i++) {
         let node = n$[i];
@@ -596,3 +623,5 @@ let parent = node[utils.NATIVE_PREFIX + 'parentNode'];
     /** @type {?NodeList<Element>} */
-    const slotsAdded = root['__noInsertionPoint'] ? null : root.querySelectorAll('slot');
+    const slotsAdded = root['__noInsertionPoint']
+      ? null
+      : root.querySelectorAll('slot');
     // Reset scoping information so normal scoing rules apply after this.
@@ -605,3 +634,5 @@ root['__noInsertionPoint'] = undefined;
     }
-    /** @type {ShadowRoot} */(root).host[utils.NATIVE_PREFIX + 'appendChild'](root);
+    /** @type {ShadowRoot} */ (root).host[utils.NATIVE_PREFIX + 'appendChild'](
+      root
+    );
   } else {
@@ -611,3 +642,3 @@ root = new ShadyRoot(ShadyRootConstructionToken, host, options);
   return root;
-}
+};
 
@@ -617,8 +648,11 @@ // Mitigate connect/disconnect spam by wrapping custom element classes. This
 // not.
-if (utils.hasCustomElements() && utils.settings.inUse && !utils.settings['preferPerformance']) {
-
+if (
+  utils.hasCustomElements() &&
+  utils.settings.inUse &&
+  !utils.settings['preferPerformance']
+) {
   // process connect/disconnect after roots have rendered to avoid
   // issues with reaction stack.
   let connectMap = new Map();
-  rootRendered = function() {
+  rootRendered = function () {
     // allow elements to connect
@@ -631,4 +665,5 @@ // save map state (without needing polyfills on IE11)
     connectMap.clear();
-    for (let i=0; i < r.length; i++) {
-      const e = r[i][0], value = r[i][1];
+    for (let i = 0; i < r.length; i++) {
+      const e = r[i][0],
+        value = r[i][1];
       if (value) {
@@ -640,3 +675,3 @@ e['__shadydom_connectedCallback']();
     }
-  }
+  };
 
@@ -646,6 +681,10 @@ // Document is in loading state and flag is set (deferConnectionCallbacks)
   if (isRendering) {
-    document.addEventListener('readystatechange', () => {
-      isRendering = false;
-      rootRendered();
-    }, {once: true});
+    document.addEventListener(
+      'readystatechange',
+      () => {
+        isRendering = false;
+        rootRendered();
+      },
+      {once: true}
+    );
   }
@@ -662,5 +701,6 @@
     if (connected || disconnected) {
-
       /** @this {!HTMLElement} */
-      base.prototype.connectedCallback = base.prototype['__shadydom_connectedCallback'] = function() {
+      base.prototype.connectedCallback = base.prototype[
+        '__shadydom_connectedCallback'
+      ] = function () {
         // if rendering defer connected
@@ -676,6 +716,8 @@ // otherwise connect only if we haven't already
         }
-      }
+      };
 
       /** @this {!HTMLElement} */
-      base.prototype.disconnectedCallback = base.prototype['__shadydom_disconnectedCallback'] = function() {
+      base.prototype.disconnectedCallback = base.prototype[
+        '__shadydom_disconnectedCallback'
+      ] = function () {
         // if rendering, cancel a pending connection and queue disconnect,
@@ -698,14 +740,17 @@ // otherwise disconnect only if a connection has been allowed
         }
-      }
+      };
     }
 
     return base;
-  }
+  };
 
   const originalDefine = window['customElements']['define'];
-  const define = function(name, constructor) {
+  const define = function (name, constructor) {
     const connected = constructor.prototype.connectedCallback;
     const disconnected = constructor.prototype.disconnectedCallback;
-    originalDefine.call(window['customElements'], name,
-        ManageConnect(constructor, connected, disconnected));
+    originalDefine.call(
+      window['customElements'],
+      name,
+      ManageConnect(constructor, connected, disconnected)
+    );
     // unpatch connected/disconnected on class; custom elements tears this off
@@ -716,3 +761,3 @@ // so the patch is maintained, but if the user calls these methods for
     constructor.prototype.disconnectedCallback = disconnected;
-  }
+  };
   // Note, it would be better to only patch the CustomElementRegistry.prototype,
@@ -725,3 +770,3 @@ // but ShadyCSS patches define directly.
     value: define,
-    configurable: true
+    configurable: true,
   });
@@ -736,2 +781,2 @@ }
   }
-}
+};

src/innerHTML.js

@@ -68,3 +68,3 @@ /**
   'track',
-  'wbr'
+  'wbr',
 ]);
@@ -80,3 +80,3 @@
   'plaintext',
-  'noscript'
+  'noscript',
 ]);
@@ -127,7 +127,7 @@
   if (node.localName === 'template') {
-    node =  /** @type {HTMLTemplateElement} */ (node).content;
+    node = /** @type {HTMLTemplateElement} */ (node).content;
   }
   let s = '';
   let c$ = callback ? callback(node) : node.childNodes;
-  for (let i=0, l=c$.length, child; (i<l) && (child=c$[i]); i++) {
+  for (let i = 0, l = c$.length, child; i < l && (child = c$[i]); i++) {
     s += getOuterHTML(child, node, callback);
@@ -134,0 +134,0 @@ }

src/link-nodes.js

@@ -13,2 +13,3 @@ /**
 import {shadyDataForNode, ensureShadyDataForNode} from './shady-data.js';
+// prettier-ignore
 import {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-instances.js';
@@ -42,4 +43,5 @@ import {patchNodeProto} from './patch-prototypes.js';
   // update ref_node.previousSibling <-> node
-  nodeData.previousSibling = ref_node ? ref_nodeData.previousSibling :
-    container[utils.SHADY_PREFIX + 'lastChild'];
+  nodeData.previousSibling = ref_node
+    ? ref_nodeData.previousSibling
+    : container[utils.SHADY_PREFIX + 'lastChild'];
   let psd = shadyDataForNode(nodeData.previousSibling);
@@ -50,3 +52,3 @@ if (psd) {
   // update node <-> ref_node
-  let nsd = shadyDataForNode(nodeData.nextSibling = ref_node);
+  let nsd = shadyDataForNode((nodeData.nextSibling = ref_node));
   if (nsd) {
@@ -83,3 +85,3 @@ nsd.previousSibling = node;
     const first = node[utils.NATIVE_PREFIX + 'firstChild'];
-    for (let n = first; n; (n = n[utils.NATIVE_PREFIX + 'nextSibling'])) {
+    for (let n = first; n; n = n[utils.NATIVE_PREFIX + 'nextSibling']) {
       linkNode(n, container, containerData, ref_node);
@@ -90,3 +92,3 @@ }
   }
-}
+};
 
@@ -113,4 +115,3 @@ export const recordRemoveChild = (node, container) => {
   // from `null` which is set if info is null.
-  nodeData.parentNode = nodeData.previousSibling =
-  nodeData.nextSibling = undefined;
+  nodeData.parentNode = nodeData.previousSibling = nodeData.nextSibling = undefined;
   if (containerData.childNodes !== undefined) {
@@ -120,3 +121,3 @@ // remove caching of childNodes
   }
-}
+};
 
@@ -134,6 +135,7 @@ /**
   nodeData.childNodes = null;
-  const first = nodeData.firstChild = node[utils.NATIVE_PREFIX + 'firstChild'];
+  const first = (nodeData.firstChild =
+    node[utils.NATIVE_PREFIX + 'firstChild']);
   nodeData.lastChild = node[utils.NATIVE_PREFIX + 'lastChild'];
   patchNode(node, InsideAcccessors);
-  for (let n = first, previous; n; (n = n[utils.NATIVE_PREFIX + 'nextSibling'])) {
+  for (let n = first, previous; n; n = n[utils.NATIVE_PREFIX + 'nextSibling']) {
     const sd = ensureShadyDataForNode(n);
@@ -146,2 +148,2 @@ sd.parentNode = adoptedParent || node;
   }
-}
+};

src/observe-changes.js

@@ -15,3 +15,2 @@ /**
 class AsyncObserver {
-
   constructor() {
@@ -38,3 +37,3 @@ this._scheduled = false;
       if (mutations.length) {
-        this.callbacks.forEach(function(cb) {
+        this.callbacks.forEach(function (cb) {
           cb(mutations);
@@ -48,6 +47,8 @@ });
     if (this.addedNodes.length || this.removedNodes.length) {
-      let mutations = [{
-        addedNodes: this.addedNodes,
-        removedNodes: this.removedNodes
-      }];
+      let mutations = [
+        {
+          addedNodes: this.addedNodes,
+          removedNodes: this.removedNodes,
+        },
+      ];
       this.addedNodes = [];
@@ -59,3 +60,2 @@ this.removedNodes = [];
   }
-
 }
@@ -68,3 +68,3 @@
 // subtree child mutations.
-export let observeChildren = function(node, callback) {
+export let observeChildren = function (node, callback) {
   const sd = ensureShadyDataForNode(node);
@@ -81,8 +81,8 @@ if (!sd.observer) {
     takeRecords() {
-      return observer.takeRecords()
-    }
+      return observer.takeRecords();
+    },
   };
-}
+};
 
-export let unobserveChildren = function(handle) {
+export let unobserveChildren = function (handle) {
   let observer = handle && handle._observer;
@@ -95,3 +95,3 @@ if (observer) {
   }
-}
+};
 
@@ -101,21 +101,25 @@ export function filterMutations(mutations, target) {
   const targetRootNode = target.getRootNode();
-  return mutations.map(function(mutation) {
-    /** @const {boolean} */
-    const mutationInScope = (targetRootNode === mutation.target.getRootNode());
-    if (mutationInScope && mutation.addedNodes) {
-      let nodes = utils.arrayFrom(mutation.addedNodes).filter(function(n) {
-        return (targetRootNode === n.getRootNode());
-      });
-      if (nodes.length) {
-        mutation = Object.create(mutation);
-        Object.defineProperty(mutation, 'addedNodes', {
-          value: nodes,
-          configurable: true
+  return mutations
+    .map(function (mutation) {
+      /** @const {boolean} */
+      const mutationInScope = targetRootNode === mutation.target.getRootNode();
+      if (mutationInScope && mutation.addedNodes) {
+        let nodes = utils.arrayFrom(mutation.addedNodes).filter(function (n) {
+          return targetRootNode === n.getRootNode();
         });
+        if (nodes.length) {
+          mutation = Object.create(mutation);
+          Object.defineProperty(mutation, 'addedNodes', {
+            value: nodes,
+            configurable: true,
+          });
+          return mutation;
+        }
+      } else if (mutationInScope) {
         return mutation;
       }
-    } else if (mutationInScope) {
-      return mutation;
-    }
-  }).filter(function(m) { return m});
+    })
+    .filter(function (m) {
+      return m;
+    });
 }

src/patch-events.js

@@ -23,3 +23,6 @@ /**
 const composedGetter = (() => {
-  const composedProp = Object.getOwnPropertyDescriptor(Event.prototype, 'composed');
+  const composedProp = Object.getOwnPropertyDescriptor(
+    Event.prototype,
+    'composed'
+  );
   return composedProp ? (ev) => composedProp.get.call(ev) : null;
@@ -34,5 +37,5 @@ })();
       return false;
-    }
-  }
-  const listener = () => {}
+    },
+  };
+  const listener = () => {};
   // NOTE: These will be unpatched at this point.
@@ -61,5 +64,5 @@ window.addEventListener('test', listener, eventOptions);
     passive,
-    nativeEventOptions: supportsEventOptions ? optionsOrCapture : capture
-  }
-}
+    nativeEventOptions: supportsEventOptions ? optionsOrCapture : capture,
+  };
+};
 
@@ -113,3 +116,3 @@ // https://github.com/w3c/webcomponents/issues/513#issuecomment-224183937
   'DOMFocusOut': true,
-  'keypress': true
+  'keypress': true,
 };
@@ -126,4 +129,4 @@
   'DOMNodeRemovedFromDocument': true,
-  'DOMSubtreeModified': true
-}
+  'DOMSubtreeModified': true,
+};
 
@@ -153,3 +156,7 @@ /**
       current = current[utils.SHADY_PREFIX + 'assignedSlot'];
-    } else if (current.nodeType === Node.DOCUMENT_FRAGMENT_NODE && current.host && (composed || current !== startRoot)) {
+    } else if (
+      current.nodeType === Node.DOCUMENT_FRAGMENT_NODE &&
+      current.host &&
+      (composed || current !== startRoot)
+    ) {
       current = current.host;
@@ -172,3 +179,3 @@ } else {
   return event.__composedPath;
-}
+};
 
@@ -183,3 +190,3 @@ function retarget(refNode, path) {
   let p$ = path;
-  for (let i=0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {
+  for (let i = 0, ancestor, lastRoot, root, rootIdx; i < p$.length; i++) {
     ancestor = p$[i];
@@ -198,3 +205,2 @@ root = getRootNodeWithFallback(ancestor);
 let EventPatches = {
-
   /**
@@ -208,4 +214,7 @@ * @this {Event}
         // TODO(web-padawan): see https://github.com/webcomponents/shadydom/issues/275
-        this.__composed = this.type === 'focusin' || this.type === 'focusout' || composedGetter(this);
-      // If the event is trusted, or `isTrusted` is not supported, check the list of always composed events
+        this.__composed =
+          this.type === 'focusin' ||
+          this.type === 'focusout' ||
+          composedGetter(this);
+        // If the event is trusted, or `isTrusted` is not supported, check the list of always composed events
       } else if (this.isTrusted !== false) {
@@ -215,3 +224,3 @@ this.__composed = alwaysComposed[this.type];
     }
-    return /** @type {!Event} */(this).__composed || false;
+    return /** @type {!Event} */ (this).__composed || false;
   },
@@ -226,3 +235,3 @@
     }
-    return /** @type {!Event} */(this).__composedPath;
+    return /** @type {!Event} */ (this).__composedPath;
   },
@@ -234,3 +243,6 @@
   get target() {
-    return retarget(this.currentTarget || this['__previousCurrentTarget'], this.composedPath());
+    return retarget(
+      this.currentTarget || this['__previousCurrentTarget'],
+      this.composedPath()
+    );
   },
@@ -247,6 +259,12 @@
     if (!this.__relatedTargetComposedPath) {
-      this.__relatedTargetComposedPath = pathComposer(this.__relatedTarget, true);
+      this.__relatedTargetComposedPath = pathComposer(
+        this.__relatedTarget,
+        true
+      );
     }
     // find the deepest node in relatedTarget composed path that is in the same root with the currentTarget
-    return retarget(this.currentTarget || this['__previousCurrentTarget'], /** @type {!Event} */(this).__relatedTargetComposedPath);
+    return retarget(
+      this.currentTarget || this['__previousCurrentTarget'],
+      /** @type {!Event} */ (this).__relatedTargetComposedPath
+    );
   },
@@ -267,4 +285,3 @@ /**
     this.__propagationStopped = true;
-  }
-
+  },
 };
@@ -275,7 +292,7 @@
   // try to do `Base.call` with a dom construtor.
-  let klazz = function(type, options) {
+  let klazz = function (type, options) {
     let event = new Base(type, options);
     event.__composed = options && Boolean(options['composed']);
     return event;
-  }
+  };
   // put constructor properties on subclass
@@ -289,6 +306,5 @@ klazz.__proto__ = Base;
   'focus': true,
-  'blur': true
+  'blur': true,
 };
 
-
 /**
@@ -300,3 +316,6 @@ * Check if the event has been retargeted by comparing original `target`, and calculated `target`
 function hasRetargeted(event) {
-  return event['__target'] !== event.target || event.__relatedTarget !== event.relatedTarget;
+  return (
+    event['__target'] !== event.target ||
+    event.__relatedTarget !== event.relatedTarget
+  );
 }
@@ -311,3 +330,5 @@
 function fireHandlers(event, node, phase) {
-  let hs = node.__handlers && node.__handlers[event.type] &&
+  let hs =
+    node.__handlers &&
+    node.__handlers[event.type] &&
     node.__handlers[event.type][phase];
@@ -329,3 +350,3 @@ if (hs) {
   const path = e.composedPath();
-  const retargetedPath = path.map(node => retarget(node, path));
+  const retargetedPath = path.map((node) => retarget(node, path));
   const bubbles = e.bubbles;
@@ -338,3 +359,3 @@
     enumerable: true,
-    get: function() {
+    get: function () {
       return currentTarget;
@@ -348,3 +369,3 @@ },
     enumerable: true,
-    get: function() {
+    get: function () {
       return eventPhase;
@@ -356,3 +377,6 @@ },
     currentTarget = path[i];
-    eventPhase = currentTarget === retargetedPath[i] ? Event.AT_TARGET : Event.CAPTURING_PHASE;
+    eventPhase =
+      currentTarget === retargetedPath[i]
+        ? Event.AT_TARGET
+        : Event.CAPTURING_PHASE;
     // capture phase fires all capture handlers
@@ -381,3 +405,10 @@ fireHandlers(e, currentTarget, 'capture');
 
-function listenerSettingsEqual(savedListener, node, type, capture, once, passive) {
+function listenerSettingsEqual(
+  savedListener,
+  node,
+  type,
+  capture,
+  once,
+  passive
+) {
   let {
@@ -388,9 +419,11 @@ node: savedNode,
     once: savedOnce,
-    passive: savedPassive
+    passive: savedPassive,
   } = savedListener;
-  return node === savedNode &&
+  return (
+    node === savedNode &&
     type === savedType &&
     capture === savedCapture &&
     once === savedOnce &&
-    passive === savedPassive;
+    passive === savedPassive
+  );
 }
@@ -400,3 +433,5 @@
   for (let i = 0; i < wrappers.length; i++) {
-    if (listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)) {
+    if (
+      listenerSettingsEqual(wrappers[i], node, type, capture, once, passive)
+    ) {
       return i;
@@ -431,4 +466,7 @@ }
   // include both connected and disconnected parts, dispatch it manually.
-  if (!utils.settings.preferPerformance && this instanceof Node &&
-      !utils.documentContains(document, this)) {
+  if (
+    !utils.settings.preferPerformance &&
+    this instanceof Node &&
+    !utils.documentContains(document, this)
+  ) {
     if (!event['__target']) {
@@ -447,4 +485,9 @@ patchEvent(event, this);
 export function addEventListener(type, fnOrObj, optionsOrCapture) {
-  const {capture, once, passive, shadyTarget, nativeEventOptions} =
-    parseEventOptions(optionsOrCapture);
+  const {
+    capture,
+    once,
+    passive,
+    shadyTarget,
+    nativeEventOptions,
+  } = parseEventOptions(optionsOrCapture);
   if (!fnOrObj) {
@@ -462,3 +505,6 @@ return;
   // bail if `fnOrObj` is an object without a `handleEvent` method
-  if (handlerType === 'object' && (!fnOrObj.handleEvent || typeof fnOrObj.handleEvent !== 'function')) {
+  if (
+    handlerType === 'object' &&
+    (!fnOrObj.handleEvent || typeof fnOrObj.handleEvent !== 'function')
+  ) {
     return;
@@ -468,3 +514,7 @@ }
   if (unpatchedEvents[type]) {
-    return this[utils.NATIVE_PREFIX + 'addEventListener'](type, fnOrObj, nativeEventOptions);
+    return this[utils.NATIVE_PREFIX + 'addEventListener'](
+      type,
+      fnOrObj,
+      nativeEventOptions
+    );
   }
@@ -497,6 +547,10 @@
    */
-  const wrapperFn = function(e) {
+  const wrapperFn = function (e) {
     // Support `once` option.
     if (once) {
-      this[utils.SHADY_PREFIX + 'removeEventListener'](type, fnOrObj, optionsOrCapture);
+      this[utils.SHADY_PREFIX + 'removeEventListener'](
+        type,
+        fnOrObj,
+        optionsOrCapture
+      );
     }
@@ -510,4 +564,12 @@ if (!e['__target']) {
       // replace `currentTarget` to make `target` and `relatedTarget` correct for inside the shadowroot
-      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(e, 'currentTarget');
-      Object.defineProperty(e, 'currentTarget', {get() { return target }, configurable: true});
+      lastCurrentTargetDesc = Object.getOwnPropertyDescriptor(
+        e,
+        'currentTarget'
+      );
+      Object.defineProperty(e, 'currentTarget', {
+        get() {
+          return target;
+        },
+        configurable: true,
+      });
       lastEventPhaseDesc = Object.getOwnPropertyDescriptor(e, 'eventPhase');
@@ -528,3 +590,6 @@ Object.defineProperty(e, 'eventPhase', {
     // or a children of the host.
-    if (targetNeedsPathCheck(target) && e.composedPath().indexOf(target) == -1) {
+    if (
+      targetNeedsPathCheck(target) &&
+      e.composedPath().indexOf(target) == -1
+    ) {
       return;
@@ -543,8 +608,14 @@ }
       // prevent non-bubbling events from triggering bubbling handlers on shadowroot, but only if not in capture phase
-      if (e.eventPhase !== Event.CAPTURING_PHASE && !e.bubbles && e.target !== target && !(target instanceof Window)) {
+      if (
+        e.eventPhase !== Event.CAPTURING_PHASE &&
+        !e.bubbles &&
+        e.target !== target &&
+        !(target instanceof Window)
+      ) {
         return;
       }
-      let ret = handlerType === 'function' ?
-        fnOrObj.call(target, e) :
-        (fnOrObj.handleEvent && fnOrObj.handleEvent(e));
+      let ret =
+        handlerType === 'function'
+          ? fnOrObj.call(target, e)
+          : fnOrObj.handleEvent && fnOrObj.handleEvent(e);
       if (target !== this) {
@@ -578,12 +649,18 @@ // Replace the original descriptors for `currentTarget` and `eventPhase`.
     passive: passive,
-    wrapperFn: wrapperFn
+    wrapperFn: wrapperFn,
   });
 
   this.__handlers = this.__handlers || {};
-  this.__handlers[type] = this.__handlers[type] ||
-    {'capture': [], 'bubble': []};
+  this.__handlers[type] = this.__handlers[type] || {
+    'capture': [],
+    'bubble': [],
+  };
   this.__handlers[type][capture ? 'capture' : 'bubble'].push(wrapperFn);
 
   if (!nonBubblingEventsToRetarget[type]) {
-    this[utils.NATIVE_PREFIX + 'addEventListener'](type, wrapperFn, nativeEventOptions);
+    this[utils.NATIVE_PREFIX + 'addEventListener'](
+      type,
+      wrapperFn,
+      nativeEventOptions
+    );
   }
@@ -599,6 +676,15 @@ }
   }
-  const {capture, once, passive, shadyTarget, nativeEventOptions} =
-    parseEventOptions(optionsOrCapture);
+  const {
+    capture,
+    once,
+    passive,
+    shadyTarget,
+    nativeEventOptions,
+  } = parseEventOptions(optionsOrCapture);
   if (unpatchedEvents[type]) {
-    return this[utils.NATIVE_PREFIX + 'removeEventListener'](type, fnOrObj, nativeEventOptions);
+    return this[utils.NATIVE_PREFIX + 'removeEventListener'](
+      type,
+      fnOrObj,
+      nativeEventOptions
+    );
   }
@@ -619,4 +705,7 @@ let target = shadyTarget || this;
   }
-  this[utils.NATIVE_PREFIX + 'removeEventListener'](type, wrapperFn || fnOrObj,
-    nativeEventOptions);
+  this[utils.NATIVE_PREFIX + 'removeEventListener'](
+    type,
+    wrapperFn || fnOrObj,
+    nativeEventOptions
+  );
   if (wrapperFn && this.__handlers && this.__handlers[type]) {
@@ -633,8 +722,12 @@ const arr = this.__handlers[type][capture ? 'capture' : 'bubble'];
   for (let ev in nonBubblingEventsToRetarget) {
-    window[utils.NATIVE_PREFIX + 'addEventListener'](ev, function(e) {
-      if (!e['__target']) {
-        patchEvent(e);
-        shadyDispatchEvent(e);
-      }
-    }, true);
+    window[utils.NATIVE_PREFIX + 'addEventListener'](
+      ev,
+      function (e) {
+        if (!e['__target']) {
+          patchEvent(e);
+          shadyDispatchEvent(e);
+        }
+      },
+      true
+    );
   }
@@ -662,3 +755,3 @@ }
     event.__proto__ = proto[SHADY_PROTO];
-  // and fallback to patching instance
+    // and fallback to patching instance
   } else {
@@ -673,3 +766,2 @@ utils.patchProperties(event, EventPatchesDescriptors);
 
-
 export function patchEvents() {
@@ -684,9 +776,12 @@ activateFocusEventOverrides();
   // Fix up `Element.prototype.click()` if `isTrusted` is supported, but `composed` isn't
-  if (!composedGetter && Object.getOwnPropertyDescriptor(Event.prototype, 'isTrusted')) {
+  if (
+    !composedGetter &&
+    Object.getOwnPropertyDescriptor(Event.prototype, 'isTrusted')
+  ) {
     /** @this {Element} */
-    const composedClickFn = function() {
+    const composedClickFn = function () {
       const ev = new MouseEvent('click', {
         bubbles: true,
         cancelable: true,
-        composed: true
+        composed: true,
       });
@@ -703,9 +798,9 @@ this[utils.SHADY_PREFIX + 'dispatchEvent'](ev);
 
-export const eventPropertyNamesForElement =
-    Object.getOwnPropertyNames(Element.prototype)
-    .filter(name => name.substring(0,2) === 'on');
+export const eventPropertyNamesForElement = Object.getOwnPropertyNames(
+  Element.prototype
+).filter((name) => name.substring(0, 2) === 'on');
 
-export const eventPropertyNamesForHTMLElement =
-    Object.getOwnPropertyNames(HTMLElement.prototype)
-    .filter(name => name.substring(0,2) === 'on');
+export const eventPropertyNamesForHTMLElement = Object.getOwnPropertyNames(
+  HTMLElement.prototype
+).filter((name) => name.substring(0, 2) === 'on');
 
@@ -719,3 +814,3 @@ /**
     /** @this {Element} */
-    set: function(fn) {
+    set: function (fn) {
       const shadyData = ensureShadyDataForNode(this);
@@ -726,3 +821,7 @@ const eventName = property.substring(2);
       }
-      shadyData.__onCallbackListeners[property] && this.removeEventListener(eventName, shadyData.__onCallbackListeners[property]);
+      shadyData.__onCallbackListeners[property] &&
+        this.removeEventListener(
+          eventName,
+          shadyData.__onCallbackListeners[property]
+        );
       this[utils.SHADY_PREFIX + 'addEventListener'](eventName, fn);
@@ -734,6 +833,10 @@ shadyData.__onCallbackListeners[property] = fn;
       const shadyData = shadyDataForNode(this);
-      return shadyData && shadyData.__onCallbackListeners && shadyData.__onCallbackListeners[property];
+      return (
+        shadyData &&
+        shadyData.__onCallbackListeners &&
+        shadyData.__onCallbackListeners[property]
+      );
     },
-    configurable: true
+    configurable: true,
   };
 };

src/patch-instances.js

@@ -15,3 +15,2 @@ /**
 export const InsideDescriptors = utils.getOwnPropertyDescriptors({
-
   /** @this {Node} */
@@ -56,3 +55,2 @@ get childNodes() {
   },
-
 });
@@ -78,3 +76,3 @@
   set innerHTML(value) {
-    return this[utils.SHADY_PREFIX + 'innerHTML'] = value;
+    this[utils.SHADY_PREFIX + 'innerHTML'] = value;
   },
@@ -84,3 +82,2 @@ });
 export const OutsideDescriptors = utils.getOwnPropertyDescriptors({
-
   /** @this {Node} */
@@ -123,5 +120,4 @@ get parentElement() {
   set className(value) {
-    return this[utils.SHADY_PREFIX + 'className'] = value;
-  }
-
+    this[utils.SHADY_PREFIX + 'className'] = value;
+  },
 });
@@ -139,3 +135,3 @@
   }
-}
+};
 
@@ -146,38 +142,44 @@ makeNonEnumerable(InsideDescriptors);
 
-const noInstancePatching = utils.settings.hasDescriptors || (utils.settings.noPatch === true);
+const noInstancePatching =
+  utils.settings.hasDescriptors || utils.settings.noPatch === true;
 
 // ensure an element has patched "outside" accessors; no-op when not needed
-export let patchOutsideElementAccessors = noInstancePatching ?
-  function() {} : function(element) {
-    const sd = ensureShadyDataForNode(element);
-    if (!sd.__outsideAccessors) {
-      sd.__outsideAccessors = true;
-      utils.patchExistingProperties(element, OutsideDescriptors);
-    }
-  }
+export let patchOutsideElementAccessors = noInstancePatching
+  ? function () {}
+  : function (element) {
+      const sd = ensureShadyDataForNode(element);
+      if (!sd.__outsideAccessors) {
+        sd.__outsideAccessors = true;
+        utils.patchExistingProperties(element, OutsideDescriptors);
+      }
+    };
 
 // ensure an element has patched "inside" accessors; no-op when not needed
-export let patchInsideElementAccessors = noInstancePatching ?
-  function() {} : function(element) {
-    const sd = ensureShadyDataForNode(element);
-    if (!sd.__insideAccessors) {
-      sd.__insideAccessors = true;
-      utils.patchExistingProperties(element, InsideDescriptors);
-      // NOTE: There are compatibility issues with patches for `textContent`
-      // and `innerHTML` between CE and SD. Since SD patches are applied
-      // via `ShadyDOM.patch` and CE patches are applied as the tree is walked,
-      // SD patches overwrite CE patches.
-      // * When SD is in patching mode, SD calls through to native
-      // methods not patched by CE (since SD is at the bottom) and CE does not
-      // upgrade, connect, or disconnect elements. Therefore do *not patch*
-      // these accessors in this case.
-      // * When SD is in `noPatch` mode, the SD patches call through to
-      // "native" methods that are patched by CE (since CE is at the bottom).
-      // Therefore continue to patch in this case.
-      // If the custom elements polyfill is not loaded, then these accessors
-      // should be patched so they work correctly.
-      if (!utils.hasPolyfilledCustomElements() || utils.settings.noPatch) {
-        utils.patchExistingProperties(element, TextContentInnerHTMLDescriptors);
+export let patchInsideElementAccessors = noInstancePatching
+  ? function () {}
+  : function (element) {
+      const sd = ensureShadyDataForNode(element);
+      if (!sd.__insideAccessors) {
+        sd.__insideAccessors = true;
+        utils.patchExistingProperties(element, InsideDescriptors);
+        // NOTE: There are compatibility issues with patches for `textContent`
+        // and `innerHTML` between CE and SD. Since SD patches are applied
+        // via `ShadyDOM.patch` and CE patches are applied as the tree is walked,
+        // SD patches overwrite CE patches.
+        // * When SD is in patching mode, SD calls through to native
+        // methods not patched by CE (since SD is at the bottom) and CE does not
+        // upgrade, connect, or disconnect elements. Therefore do *not patch*
+        // these accessors in this case.
+        // * When SD is in `noPatch` mode, the SD patches call through to
+        // "native" methods that are patched by CE (since CE is at the bottom).
+        // Therefore continue to patch in this case.
+        // If the custom elements polyfill is not loaded, then these accessors
+        // should be patched so they work correctly.
+        if (!utils.hasPolyfilledCustomElements() || utils.settings.noPatch) {
+          utils.patchExistingProperties(
+            element,
+            TextContentInnerHTMLDescriptors
+          );
+        }
       }
-    }
-  }
+    };

src/patch-native.js

@@ -28,3 +28,3 @@ /**
     return this[NATIVE_PREFIX + 'querySelectorAll'](selector);
-  }
+  },
 };
@@ -38,3 +38,3 @@ // Object on which raw native accessors are available via `accessorName(node)`.
   nativeTree[name] = (node) => node[NATIVE_PREFIX + name];
-}
+};
 
@@ -45,5 +45,4 @@ const installNativeMethod = (name, fn) => {
   }
-}
+};
 
-
 const defineNativeAccessors = (proto, descriptors) => {
@@ -55,3 +54,3 @@ patchProperties(proto, descriptors, NATIVE_PREFIX);
   }
-}
+};
 
@@ -72,11 +71,19 @@ const copyProperties = (proto, list = []) => {
   }
-}
+};
 
 /** @type {!TreeWalker} */
-const nodeWalker = document.createTreeWalker(document, NodeFilter.SHOW_ALL,
-  null, false);
+const nodeWalker = document.createTreeWalker(
+  document,
+  NodeFilter.SHOW_ALL,
+  null,
+  false
+);
 
 /** @type {!TreeWalker} */
-const elementWalker = document.createTreeWalker(document, NodeFilter.SHOW_ELEMENT,
-  null, false);
+const elementWalker = document.createTreeWalker(
+  document,
+  NodeFilter.SHOW_ELEMENT,
+  null,
+  false
+);
 
@@ -86,3 +93,3 @@ /** @type {!Document} */
 
-const clearNode = node => {
+const clearNode = (node) => {
   let firstChild;
@@ -92,3 +99,3 @@ while ((firstChild = node[NATIVE_PREFIX + 'firstChild'])) {
   }
-}
+};
 
@@ -111,3 +118,2 @@ const ParentNodeAccessors = [
 export const addNativePrefixedProperties = () => {
-
   // EventTarget
@@ -117,6 +123,13 @@ const eventProps = [
     'addEventListener',
-    'removeEventListener'
+    'removeEventListener',
   ];
   if (window.EventTarget) {
     copyProperties(window.EventTarget.prototype, eventProps);
+
+    // In Firefox 31, `EventTarget` exists, but `EventTarget.prototype` is not
+    // in the prototype chain of `window` and, strangely,
+    // `window instanceof EventTarget` still returns true.
+    if (window[NATIVE_PREFIX + 'addEventListener'] === undefined) {
+      copyProperties(Window.prototype, eventProps);
+    }
   } else {
@@ -127,3 +140,2 @@ copyProperties(Node.prototype, eventProps);
 
-
   // Node
@@ -148,3 +160,3 @@ if (hasDescriptors) {
           return nodeWalker.parentNode();
-        }
+        },
       },
@@ -156,3 +168,3 @@ firstChild: {
           return nodeWalker.firstChild();
-        }
+        },
       },
@@ -164,4 +176,3 @@ lastChild: {
           return nodeWalker.lastChild();
-        }
-
+        },
       },
@@ -173,3 +184,3 @@ previousSibling: {
           return nodeWalker.previousSibling();
-        }
+        },
       },
@@ -181,3 +192,3 @@ nextSibling: {
           return nodeWalker.nextSibling();
-        }
+        },
       },
@@ -196,3 +207,3 @@ // TODO(sorvell): make this a NodeList or whatever
           return nodes;
-        }
+        },
       },
@@ -204,3 +215,3 @@ parentElement: {
           return elementWalker.parentNode();
-        }
+        },
       },
@@ -210,3 +221,2 @@ textContent: {
         get() {
-          /* eslint-disable no-case-declarations */
           switch (this.nodeType) {
@@ -217,6 +227,13 @@ case Node.ELEMENT_NODE:
               // at least for Safari 9, but it's unclear why.
-              const textWalker = document.createTreeWalker(this, NodeFilter.SHOW_TEXT,
-                null, false);
-              let content = '', n;
-              while ( (n = textWalker.nextNode()) ) {
+              // eslint-disable-next-line no-case-declarations
+              const textWalker = document.createTreeWalker(
+                this,
+                NodeFilter.SHOW_TEXT,
+                null,
+                false
+              );
+              // eslint-disable-next-line no-case-declarations
+              let content = '',
+                n;
+              while ((n = textWalker.nextNode())) {
                 // TODO(sorvell): can't use textContent since we patch it on Node.prototype!
@@ -235,3 +252,3 @@ // However, should probably patch it only on element.
           if (typeof value === 'undefined' || value === null) {
-            value = ''
+            value = '';
           }
@@ -245,3 +262,6 @@ switch (this.nodeType) {
                 // Note: old Chrome versions require 2nd argument here
-                this[NATIVE_PREFIX + 'insertBefore'](document.createTextNode(value), undefined);
+                this[NATIVE_PREFIX + 'insertBefore'](
+                  document.createTextNode(value),
+                  undefined
+                );
               }
@@ -254,4 +274,4 @@ break;
           }
-        }
-      }
+        },
+      },
     });
@@ -266,10 +286,7 @@ }
     'cloneNode',
-    'contains'
+    'contains',
   ]);
 
   // NOTE, on some browsers IE 11 / Edge 15 some properties are incorrectly on HTMLElement
-  copyProperties(HTMLElement.prototype, [
-    'parentElement',
-    'contains'
-  ]);
+  copyProperties(HTMLElement.prototype, ['parentElement', 'contains']);
 
@@ -282,3 +299,3 @@ const ParentNodeWalkerDescriptors = {
         return elementWalker.firstChild();
-      }
+      },
     },
@@ -290,3 +307,3 @@ lastElementChild: {
         return elementWalker.lastChild();
-      }
+      },
     },
@@ -304,3 +321,3 @@ children: {
         return utils.createPolyfilledHTMLCollection(nodes);
-      }
+      },
     },
@@ -314,4 +331,4 @@ childElementCount: {
         return 0;
-      }
-    }
+      },
+    },
   };
@@ -327,3 +344,3 @@
       'innerHTML',
-      'className'
+      'className',
     ]);
@@ -335,3 +352,3 @@
       'innerHTML',
-      'className'
+      'className',
     ]);
@@ -346,3 +363,3 @@ } else {
           return elementWalker.previousSibling();
-        }
+        },
       },
@@ -354,3 +371,3 @@ nextElementSibling: {
           return elementWalker.nextSibling();
-        }
+        },
       },
@@ -365,15 +382,25 @@ innerHTML: {
         set(value) {
-          const content = this.localName === 'template' ?
-          /** @type {HTMLTemplateElement} */(this).content : this;
+          const content =
+            this.localName === 'template'
+              ? /** @type {HTMLTemplateElement} */ (this).content
+              : this;
           clearNode(content);
           const containerName = this.localName || 'div';
           let htmlContainer;
-          if (!this.namespaceURI || this.namespaceURI === inertDoc.namespaceURI) {
+          if (
+            !this.namespaceURI ||
+            this.namespaceURI === inertDoc.namespaceURI
+          ) {
             htmlContainer = inertDoc.createElement(containerName);
           } else {
-            htmlContainer = inertDoc.createElementNS(this.namespaceURI, containerName);
+            htmlContainer = inertDoc.createElementNS(
+              this.namespaceURI,
+              containerName
+            );
           }
           htmlContainer.innerHTML = value;
-          const newContent = this.localName === 'template' ?
-            /** @type {HTMLTemplateElement} */(htmlContainer).content : htmlContainer;
+          const newContent =
+            this.localName === 'template'
+              ? /** @type {HTMLTemplateElement} */ (htmlContainer).content
+              : htmlContainer;
           let firstChild;
@@ -384,3 +411,3 @@ while ((firstChild = newContent[NATIVE_PREFIX + 'firstChild'])) {
           }
-        }
+        },
       },
@@ -395,4 +422,4 @@ className: {
           this.setAttribute('class', value);
-        }
-      }
+        },
+      },
     });
@@ -413,6 +440,3 @@ }
   // HTMLElement
-  copyProperties(HTMLElement.prototype, [
-    'focus',
-    'blur'
-  ]);
+  copyProperties(HTMLElement.prototype, ['focus', 'blur']);
 
@@ -431,3 +455,6 @@ // HTMLTemplateElement
   } else {
-    defineNativeAccessors(DocumentFragment.prototype, ParentNodeWalkerDescriptors);
+    defineNativeAccessors(
+      DocumentFragment.prototype,
+      ParentNodeWalkerDescriptors
+    );
   }
@@ -440,5 +467,3 @@
     copyProperties(Document.prototype, ParentNodeAccessors);
-    copyProperties(Document.prototype, [
-      'activeElement'
-    ]);
+    copyProperties(Document.prototype, ['activeElement']);
   } else {
@@ -450,6 +475,7 @@ defineNativeAccessors(Document.prototype, ParentNodeWalkerDescriptors);
     'importNode',
-    'getElementById'
+    'getElementById',
+    'elementFromPoint',
+    utils.getPropertyName(Document.prototype, 'elementsFromPoint'),
   ]);
   copyProperties(Document.prototype, ParentNodeMethods);
-
 };

src/patch-prototypes.js

@@ -15,2 +15,3 @@ /**
 import {SlotablePatches} from './patches/Slotable.js';
+// prettier-ignore
 import {ParentNodePatches, ParentNodeDocumentOrFragmentPatches} from './patches/ParentNode.js';
@@ -52,3 +53,4 @@ import {ChildNodePatches} from './patches/ChildNode.js';
 // and we can patch accessors (hasDescriptors).
-const ElementShouldHaveInnerHTML = !utils.settings.hasDescriptors || 'innerHTML' in Element.prototype;
+const ElementShouldHaveInnerHTML =
+  !utils.settings.hasDescriptors || 'innerHTML' in Element.prototype;
 
@@ -63,12 +65,25 @@ // setup patching
   ProcessingInstruction: [SlotablePatches],
-  Element: [ElementPatches, ParentNodePatches, ChildNodePatches, SlotablePatches,
+  Element: [
+    ElementPatches,
+    ParentNodePatches,
+    ChildNodePatches,
+    SlotablePatches,
     ElementShouldHaveInnerHTML ? ElementOrShadowRootPatches : null,
-    !window.HTMLSlotElement ? SlotPatches : null],
+    !window.HTMLSlotElement ? SlotPatches : null,
+  ],
   HTMLElement: [HTMLElementPatches, NonStandardHTMLElement],
   HTMLSlotElement: [SlotPatches],
-  DocumentFragment: [ParentNodeDocumentOrFragmentPatches, DocumentOrFragmentPatches],
-  Document: [DocumentPatches, ParentNodeDocumentOrFragmentPatches, DocumentOrFragmentPatches, DocumentOrShadowRootPatches],
+  DocumentFragment: [
+    ParentNodeDocumentOrFragmentPatches,
+    DocumentOrFragmentPatches,
+  ],
+  Document: [
+    DocumentPatches,
+    ParentNodeDocumentOrFragmentPatches,
+    DocumentOrFragmentPatches,
+    DocumentOrShadowRootPatches,
+  ],
   Window: [WindowPatches],
   CharacterData: [ChildNodePatches],
-}
+};
 
@@ -80,3 +95,5 @@ const getPatchPrototype = (name) => window[name] && window[name].prototype;
 // CustomElements polyfill *only* cares about these accessors.
-const disallowedNativePatches = utils.settings.hasDescriptors ? null : ['innerHTML', 'textContent'];
+const disallowedNativePatches = utils.settings.hasDescriptors
+  ? null
+  : ['innerHTML', 'textContent'];
 
@@ -91,4 +108,6 @@ /**
 function applyPatchList(proto, list, prefix, disallowed) {
-  list.forEach(patch => proto && patch &&
-    utils.patchProperties(proto, patch, prefix, disallowed));
+  list.forEach(
+    (patch) =>
+      proto && patch && utils.patchProperties(proto, patch, prefix, disallowed)
+  );
 }
@@ -103,3 +122,3 @@
   }
-}
+};
 
@@ -119,3 +138,3 @@ const PROTO_IS_PATCHED = utils.SHADY_PREFIX + 'protoIsPatched';
 // the type of Node when patching an can always assume we're patching an element.
-['Text', 'Comment', 'CDATASection', 'ProcessingInstruction'].forEach(name => {
+['Text', 'Comment', 'CDATASection', 'ProcessingInstruction'].forEach((name) => {
   const ctor = window[name];
@@ -140,3 +159,3 @@ const patchedProto = Object.create(ctor.prototype);
   return proto;
-}
+};
 
@@ -151,3 +170,4 @@ export const patchNodeProto = (node) => {
   // patched, without this check, an <input> element would get the wrong patch.
-  let proto = nativeProto.hasOwnProperty(PATCHED_PROTO) && nativeProto[PATCHED_PROTO];
+  let proto =
+    nativeProto.hasOwnProperty(PATCHED_PROTO) && nativeProto[PATCHED_PROTO];
   if (!proto) {
@@ -159,7 +179,7 @@ proto = Object.create(nativeProto);
   Object.setPrototypeOf(node, proto);
-}
+};
 
 export const patchShadowOnElement = () => {
   utils.patchProperties(Element.prototype, ElementShadowPatches);
-}
+};
 
@@ -166,0 +186,0 @@ export const addShadyPrefixedProperties = () => {

src/patch-shadyRoot.js

@@ -13,2 +13,3 @@ /**
 import {NodePatches} from './patches/Node.js';
+// prettier-ignore
 import {OutsideDescriptors, InsideDescriptors, TextContentInnerHTMLDescriptors} from './patch-instances.js';
@@ -43,6 +44,7 @@ import {ParentNodePatches} from './patches/ParentNode.js';
     utils.patchProperties(proto, DocumentOrFragmentPatches, prefix);
+  }
   // Case 2, bad descriptors: Ensure accessors are on ShadowRoot.
   // These descriptors are normally used for instance patching but because
   // ShadyRoot can always be patched, just do it to the prototype.
-  } else if (!utils.settings.hasDescriptors) {
+  else if (!utils.settings.hasDescriptors) {
     utils.patchProperties(proto, OutsideDescriptors);
@@ -52,3 +54,3 @@ utils.patchProperties(proto, InsideDescriptors);
   }
-}
+};
 
@@ -67,23 +69,19 @@ export const patchShadyRoot = (proto) => {
       value: Node.DOCUMENT_FRAGMENT_NODE,
-      configurable: true
+      configurable: true,
     },
     nodeName: {
       value: '#document-fragment',
-      configurable: true
+      configurable: true,
     },
     nodeValue: {
       value: null,
-      configurable: true
-    }
+      configurable: true,
+    },
   });
 
   // make undefined
-  [
-    'localName',
-    'namespaceURI',
-    'prefix'
-  ].forEach((prop) => {
+  ['localName', 'namespaceURI', 'prefix'].forEach((prop) => {
     Object.defineProperty(proto, prop, {
       value: undefined,
-      configurable: true
+      configurable: true,
     });
@@ -93,7 +91,3 @@ });
   // defer properties to host
-  [
-    'ownerDocument',
-    'baseURI',
-    'isConnected'
-  ].forEach((prop) => {
+  ['ownerDocument', 'baseURI', 'isConnected'].forEach((prop) => {
     Object.defineProperty(proto, prop, {
@@ -104,5 +98,5 @@ /** @this {ShadowRoot} */
       },
-      configurable: true
+      configurable: true,
     });
   });
-}
+};

src/patches/ChildNode.js

@@ -21,3 +21,6 @@ /**
     const nextSibling = this[utils.SHADY_PREFIX + 'nextSibling'];
-    parentNode[utils.SHADY_PREFIX + 'insertBefore'](utils.convertNodesIntoANode(...args), nextSibling);
+    parentNode[utils.SHADY_PREFIX + 'insertBefore'](
+      utils.convertNodesIntoANode(...args),
+      nextSibling
+    );
   },
@@ -31,3 +34,6 @@
     }
-    parentNode[utils.SHADY_PREFIX + 'insertBefore'](utils.convertNodesIntoANode(...args), this);
+    parentNode[utils.SHADY_PREFIX + 'insertBefore'](
+      utils.convertNodesIntoANode(...args),
+      this
+    );
   },
@@ -52,4 +58,7 @@
     parentNode[utils.SHADY_PREFIX + 'removeChild'](this);
-    parentNode[utils.SHADY_PREFIX + 'insertBefore'](utils.convertNodesIntoANode(...args), nextSibling);
+    parentNode[utils.SHADY_PREFIX + 'insertBefore'](
+      utils.convertNodesIntoANode(...args),
+      nextSibling
+    );
   },
 });

src/patches/Document.js

@@ -16,3 +16,2 @@ /**
 export const DocumentPatches = utils.getOwnPropertyDescriptors({
-
   // note: Though not technically correct, we fast path `importNode`
@@ -36,3 +35,7 @@ // when called on a node not owned by the main document.
     if (deep) {
-      for (let c=node[utils.SHADY_PREFIX + 'firstChild'], nc; c; c = c[utils.SHADY_PREFIX + 'nextSibling']) {
+      for (
+        let c = node[utils.SHADY_PREFIX + 'firstChild'], nc;
+        c;
+        c = c[utils.SHADY_PREFIX + 'nextSibling']
+      ) {
         nc = this[utils.SHADY_PREFIX + 'importNode'](c, true);
@@ -43,4 +46,3 @@ n[utils.SHADY_PREFIX + 'appendChild'](nc);
     return n;
-  }
-
-});
+  },
+});

src/patches/DocumentOrFragment.js

@@ -11,6 +11,5 @@ /**
 import * as utils from '../utils.js';
-import { query } from './ParentNode.js';
+import {query} from './ParentNode.js';
 
 export const DocumentOrFragmentPatches = utils.getOwnPropertyDescriptors({
-
   /**
@@ -24,10 +23,13 @@ * @this {Element}
     }
-    let result = query(this, function(n) {
-      return n.id == id;
-    }, function(n) {
-      return Boolean(n);
-    })[0];
+    let result = query(
+      this,
+      function (n) {
+        return n.id == id;
+      },
+      function (n) {
+        return Boolean(n);
+      }
+    )[0];
     return result || null;
-  }
-
-});
+  },
+});

src/patches/DocumentOrShadowRoot.js

@@ -22,4 +22,29 @@ /**
 
+// Get the element within the given set of roots.
+function getElInRoot(roots, el) {
+  let elRoot;
+  while (
+    el &&
+    !roots.has((elRoot = el[utils.SHADY_PREFIX + 'getRootNode']()))
+  ) {
+    el = elRoot.host;
+  }
+  return el;
+}
+
+function getAncestorRoots(docOrRoot) {
+  const roots = new Set();
+  roots.add(docOrRoot);
+  while (utils.isShadyRoot(docOrRoot) && docOrRoot.host) {
+    docOrRoot = docOrRoot.host[utils.SHADY_PREFIX + 'getRootNode']();
+    roots.add(docOrRoot);
+  }
+  return roots;
+}
+
+const elementsFromPointProperty =
+  utils.NATIVE_PREFIX +
+  utils.getPropertyName(Document.prototype, 'elementsFromPoint');
+
 export const DocumentOrShadowRootPatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Document|ShadowRoot} */
@@ -34,3 +59,3 @@ get activeElement() {
     }
-    let isShadyRoot = !!(utils.isShadyRoot(this));
+    let isShadyRoot = !!utils.isShadyRoot(this);
     if (this !== document) {
@@ -45,4 +70,6 @@ // If this node isn't a document or shady root, then it doesn't have
       // then it doesn't have an active element.
-      if (this.host === active ||
-          !this.host[utils.NATIVE_PREFIX + 'contains'](active)) {
+      if (
+        this.host === active ||
+        !this.host[utils.NATIVE_PREFIX + 'contains'](active)
+      ) {
         return null;
@@ -67,3 +94,28 @@ }
     }
-  }
+  },
+
+  /** @this {Document|ShadowRoot} */
+  elementsFromPoint(x, y) {
+    const nativeResult = utils.arrayFrom(
+      document[elementsFromPointProperty](x, y)
+    );
+    // Filter native result to return the element in this root
+    // OR an above root.
+    // Set containing this root and its ancestor roots.
+    const ancestorRoots = getAncestorRoots(this);
+    // Use a Set since the elements can repeat.
+    const rootedResult = new Set();
+    for (let i = 0; i < nativeResult.length; i++) {
+      rootedResult.add(getElInRoot(ancestorRoots, nativeResult[i]));
+    }
+    // Note, for IE compat avoid Array.from(set).
+    const r = [];
+    rootedResult.forEach((x) => r.push(x));
+    return r;
+  },
+
+  /** @this {Document|ShadowRoot} */
+  elementFromPoint(x, y) {
+    return this[utils.SHADY_PREFIX + 'elementsFromPoint'](x, y)[0] || null;
+  },
 });

src/patches/Element.js

@@ -15,2 +15,3 @@ /**
 import {attachShadow, ownerShadyRootForNode} from '../attach-shadow.js';
+// prettier-ignore
 import {eventPropertyNamesForElement, wrappedDescriptorForEventProperty} from '../patch-events.js';
@@ -43,3 +44,2 @@
 export const ElementPatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Element} */
@@ -124,8 +124,7 @@ get previousElementSibling() {
     }
-  }
-
+  },
 });
 
 if (!utils.settings.preferPerformance) {
-  eventPropertyNamesForElement.forEach(property => {
+  eventPropertyNamesForElement.forEach((property) => {
     ElementPatches[property] = wrappedDescriptorForEventProperty(property);
@@ -158,3 +157,3 @@ });
     const nodeData = shadyDataForNode(this);
-    return nodeData && nodeData.publicRoot || null;
+    return (nodeData && nodeData.publicRoot) || null;
   },
@@ -161,0 +160,0 @@ });

src/patches/ElementOrShadowRoot.js

@@ -19,8 +19,9 @@ /**
 export const ElementOrShadowRootPatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Element} */
   get innerHTML() {
     if (utils.isTrackingLogicalChildNodes(this)) {
-      const content = this.localName === 'template' ?
-      /** @type {HTMLTemplateElement} */(this).content : this;
+      const content =
+        this.localName === 'template'
+          ? /** @type {HTMLTemplateElement} */ (this).content
+          : this;
       return getInnerHTML(content, utils.childNodesArray);
@@ -46,3 +47,6 @@ } else {
       } else {
-        htmlContainer = inertDoc.createElementNS(this.namespaceURI, containerName);
+        htmlContainer = inertDoc.createElementNS(
+          this.namespaceURI,
+          containerName
+        );
       }
@@ -59,4 +63,3 @@ if (utils.settings.hasDescriptors) {
     }
-  }
-
+  },
 });

src/patches/EventTarget.js

@@ -12,6 +12,6 @@ /**
 import * as utils from '../utils.js';
+// prettier-ignore
 import {addEventListener, removeEventListener, dispatchEvent} from '../patch-events.js';
 
 export const EventTargetPatches = utils.getOwnPropertyDescriptors({
-
   dispatchEvent,
@@ -21,4 +21,3 @@
 
-  removeEventListener
-
-});
+  removeEventListener,
+});

src/patches/HTMLElement.js

@@ -12,2 +12,3 @@ /**
 import * as utils from '../utils.js';
+// prettier-ignore
 import {eventPropertyNamesForHTMLElement, wrappedDescriptorForEventProperty} from '../patch-events.js';
@@ -17,3 +18,2 @@ import {shadyDataForNode} from '../shady-data.js';
 export const HTMLElementPatches = utils.getOwnPropertyDescriptors({
-
   /** @this {HTMLElement} */
@@ -29,10 +29,9 @@ blur() {
     }
-  }
-
+  },
 });
 
 if (!utils.settings.preferPerformance) {
-  eventPropertyNamesForHTMLElement.forEach(property => {
+  eventPropertyNamesForHTMLElement.forEach((property) => {
     HTMLElementPatches[property] = wrappedDescriptorForEventProperty(property);
   });
 }

src/patches/Node.js

@@ -12,4 +12,4 @@ /**
 import * as utils from '../utils.js';
-import {getScopingShim, removeShadyScoping, replaceShadyScoping,
-  treeVisitor, currentScopeForNode, currentScopeIsCorrect } from '../style-scoping.js';
+// prettier-ignore
+import {getScopingShim, removeShadyScoping, replaceShadyScoping, treeVisitor, currentScopeForNode, currentScopeIsCorrect} from '../style-scoping.js';
 import {shadyDataForNode, ensureShadyDataForNode} from '../shady-data.js';
@@ -23,8 +23,9 @@ import {recordInsertBefore, recordRemoveChild} from '../link-nodes.js';
 
-const nativeIsConnectedAccessors =
-/** @type {ObjectPropertyDescriptor} */(
-  Object.getOwnPropertyDescriptor(Node.prototype, 'isConnected')
-);
+const nativeIsConnectedAccessors = /** @type {ObjectPropertyDescriptor} */ (Object.getOwnPropertyDescriptor(
+  Node.prototype,
+  'isConnected'
+));
 
-const nativeIsConnected = nativeIsConnectedAccessors && nativeIsConnectedAccessors.get;
+const nativeIsConnected =
+  nativeIsConnectedAccessors && nativeIsConnectedAccessors.get;
 
@@ -41,3 +42,7 @@ export function clearNode(node) {
   if (hasCachedOwnerRoot(node)) {
-    for (let n=node[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
+    for (
+      let n = node[utils.SHADY_PREFIX + 'firstChild'];
+      n;
+      n = n[utils.SHADY_PREFIX + 'nextSibling']
+    ) {
       removeOwnerShadyRoot(n);
@@ -73,4 +78,5 @@ }
     if (flattened) {
-      composed = flattened.length ? flattened[0] :
-        firstComposedNode(node[utils.SHADY_PREFIX + 'nextSibling']);
+      composed = flattened.length
+        ? flattened[0]
+        : firstComposedNode(node[utils.SHADY_PREFIX + 'nextSibling']);
     }
@@ -107,3 +113,2 @@ }
 export const NodePatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Node} */
@@ -151,3 +156,7 @@ get parentNode() {
         nodeData.childNodes = [];
-        for (let n=this[utils.SHADY_PREFIX + 'firstChild']; n; n=n[utils.SHADY_PREFIX + 'nextSibling']) {
+        for (
+          let n = this[utils.SHADY_PREFIX + 'firstChild'];
+          n;
+          n = n[utils.SHADY_PREFIX + 'nextSibling']
+        ) {
           nodeData.childNodes.push(n);
@@ -160,5 +169,5 @@ }
     }
-    childNodes.item = function(index) {
+    childNodes.item = function (index) {
       return childNodes[index];
-    }
+    };
     return childNodes;
@@ -193,3 +202,7 @@ },
     while (node && !(node instanceof Document)) {
-      node = node[utils.SHADY_PREFIX + 'parentNode'] || (utils.isShadyRoot(node) ? /** @type {ShadowRoot} */(node).host : undefined);
+      node =
+        node[utils.SHADY_PREFIX + 'parentNode'] ||
+        (utils.isShadyRoot(node)
+          ? /** @type {ShadowRoot} */ (node).host
+          : undefined);
     }
@@ -203,3 +216,7 @@ return !!(node && node instanceof Document);
       let tc = [];
-      for (let n=this[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
+      for (
+        let n = this[utils.SHADY_PREFIX + 'firstChild'];
+        n;
+        n = n[utils.SHADY_PREFIX + 'nextSibling']
+      ) {
         if (n.nodeType !== Node.COMMENT_NODE) {
@@ -221,3 +238,3 @@ tc.push(n[utils.SHADY_PREFIX + 'textContent']);
     if (typeof value === 'undefined' || value === null) {
-      value = ''
+      value = '';
     }
@@ -227,7 +244,12 @@ switch (this.nodeType) {
       case Node.DOCUMENT_FRAGMENT_NODE:
-        if (!utils.isTrackingLogicalChildNodes(this) && utils.settings.hasDescriptors) {
+        if (
+          !utils.isTrackingLogicalChildNodes(this) &&
+          utils.settings.hasDescriptors
+        ) {
           // may be removing a nested slot but fast path if we know we are not.
           const firstChild = this[utils.SHADY_PREFIX + 'firstChild'];
-          if (firstChild != this[utils.SHADY_PREFIX + 'lastChild'] ||
-            (firstChild && firstChild.nodeType != Node.TEXT_NODE)) {
+          if (
+            firstChild != this[utils.SHADY_PREFIX + 'lastChild'] ||
+            (firstChild && firstChild.nodeType != Node.TEXT_NODE)
+          ) {
             clearNode(this);
@@ -240,3 +262,5 @@ }
           if (value.length > 0 || this.nodeType === Node.ELEMENT_NODE) {
-            this[utils.SHADY_PREFIX + 'insertBefore'](document.createTextNode(value))
+            this[utils.SHADY_PREFIX + 'insertBefore'](
+              document.createTextNode(value)
+            );
           }
@@ -269,3 +293,5 @@ }
     if (node === this) {
-      throw Error(`Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`);
+      throw Error(
+        `Failed to execute 'appendChild' on 'Node': The new child element contains the parent.`
+      );
     }
@@ -275,6 +301,11 @@ if (ref_node) {
       const p = refData && refData.parentNode;
-      if ((p !== undefined && p !== this) ||
-        (p === undefined && ref_node[utils.NATIVE_PREFIX + 'parentNode'] !== this)) {
-        throw Error(`Failed to execute 'insertBefore' on 'Node': The node ` +
-        `before which the new node is to be inserted is not a child of this node.`);
+      if (
+        (p !== undefined && p !== this) ||
+        (p === undefined &&
+          ref_node[utils.NATIVE_PREFIX + 'parentNode'] !== this)
+      ) {
+        throw Error(
+          `Failed to execute 'insertBefore' on 'Node': The node ` +
+            `before which the new node is to be inserted is not a child of this node.`
+        );
       }
@@ -290,3 +321,5 @@ }
     /** @type {string} */
-    const newScopeName = ownerRoot ? ownerRoot.host.localName : currentScopeForNode(this);
+    const newScopeName = ownerRoot
+      ? ownerRoot.host.localName
+      : currentScopeForNode(this);
     /** @type {string} */
@@ -313,10 +346,13 @@ let oldScopeName;
     let allowNativeInsert = true;
-    const needsScoping = (!preferPerformance ||
+    const needsScoping =
+      (!preferPerformance ||
         // Under preferPerformance, only re-scope if we're not coming from a
         // pre-scoped doc fragment or back into a pre-scoped doc fragment
         (node['__noInsertionPoint'] === undefined &&
-         this['__noInsertionPoint'] === undefined)) &&
-        !currentScopeIsCorrect(node, newScopeName);
-    const needsSlotFinding = ownerRoot && !node['__noInsertionPoint'] &&
-        (!preferPerformance || node.nodeType === Node.DOCUMENT_FRAGMENT_NODE);
+          this['__noInsertionPoint'] === undefined)) &&
+      !currentScopeIsCorrect(node, newScopeName);
+    const needsSlotFinding =
+      ownerRoot &&
+      !node['__noInsertionPoint'] &&
+      (!preferPerformance || node.nodeType === Node.DOCUMENT_FRAGMENT_NODE);
     if (needsSlotFinding || needsScoping) {
@@ -338,3 +374,3 @@ // NOTE: avoid node.removeChild as this *can* trigger another patched
         if (needsSlotFinding && node.localName === 'slot') {
-          slotsAdded.push(/** @type {!HTMLSlotElement} */(node));
+          slotsAdded.push(/** @type {!HTMLSlotElement} */ (node));
         }
@@ -365,5 +401,6 @@ if (needsScoping) {
         }
+      }
       // when inserting into a slot inside a shadowRoot, render the
       // containing shadowRoot to update fallback content.
-      } else if (ownerRoot && this.localName === 'slot') {
+      else if (ownerRoot && this.localName === 'slot') {
         allowNativeInsert = false;
@@ -375,4 +412,5 @@ ownerRoot._asyncRender();
       // if adding to a shadyRoot, add to host instead
-      let container = utils.isShadyRoot(this) ?
-        /** @type {ShadowRoot} */(this).host : this;
+      let container = utils.isShadyRoot(this)
+        ? /** @type {ShadowRoot} */ (this).host
+        : this;
       // if ref_node, get the ref_node that's actually in composed dom.
@@ -385,2 +423,3 @@ if (ref_node) {
       }
+    }
     // Since ownerDocument is not patched, it can be incorrect after this call
@@ -390,3 +429,3 @@ // if the node is physically appended via distribution. This can result
     // We correct this by calling `adoptNode`.
-    } else if (node.ownerDocument !== this.ownerDocument) {
+    else if (node.ownerDocument !== this.ownerDocument) {
       this.ownerDocument.adoptNode(node);
@@ -422,4 +461,5 @@ }
     if (node[utils.SHADY_PREFIX + 'parentNode'] !== this) {
-      throw Error('The node to be removed is not a child of this node: ' +
-        node);
+      throw Error(
+        'The node to be removed is not a child of this node: ' + node
+      );
     }
@@ -429,3 +469,4 @@ scheduleObserver(this, null, node);
     let ownerRoot = ownerShadyRootForNode(node);
-    const removingInsertionPoint = ownerRoot && ownerRoot._removeContainedSlots(node);
+    const removingInsertionPoint =
+      ownerRoot && ownerRoot._removeContainedSlots(node);
     const parentData = shadyDataForNode(this);
@@ -441,4 +482,8 @@ if (utils.isTrackingLogicalChildNodes(this)) {
     // is not going to be rescoped in `insertBefore`
-    if (getScopingShim() && !skipUnscoping && ownerRoot
-      && node.nodeType !== Node.TEXT_NODE) {
+    if (
+      getScopingShim() &&
+      !skipUnscoping &&
+      ownerRoot &&
+      node.nodeType !== Node.TEXT_NODE
+    ) {
       const oldScopeName = currentScopeForNode(node);
@@ -462,5 +507,5 @@ treeVisitor(node, (node) => {
       // if removing from a shadyRoot, remove from host instead
-      let container = utils.isShadyRoot(this) ?
-        /** @type {ShadowRoot} */(this).host :
-        this;
+      let container = utils.isShadyRoot(this)
+        ? /** @type {ShadowRoot} */ (this).host
+        : this;
       // not guaranteed to physically be in container; e.g.
@@ -470,4 +515,6 @@ // (1) if parent has a shadyRoot, element may or may not at distributed
       // (2) if parent is a slot, element may not ben in composed dom
-      if (!(parentData.root || node.localName === 'slot') ||
-        (container === node[utils.NATIVE_PREFIX + 'parentNode'])) {
+      if (
+        !(parentData.root || node.localName === 'slot') ||
+        container === node[utils.NATIVE_PREFIX + 'parentNode']
+      ) {
         container[utils.NATIVE_PREFIX + 'removeChild'](node);
@@ -503,3 +550,7 @@ }
       if (deep && n.nodeType !== Node.ATTRIBUTE_NODE) {
-        for (let c=this[utils.SHADY_PREFIX + 'firstChild'], nc; c; c = c[utils.SHADY_PREFIX + 'nextSibling']) {
+        for (
+          let c = this[utils.SHADY_PREFIX + 'firstChild'], nc;
+          c;
+          c = c[utils.SHADY_PREFIX + 'nextSibling']
+        ) {
           nc = c[utils.SHADY_PREFIX + 'cloneNode'](true);
@@ -518,3 +569,3 @@ n[utils.SHADY_PREFIX + 'appendChild'](nc);
   // TODO(sorvell): implement `options` e.g. `{ composed: boolean }`
-  getRootNode(options) { // eslint-disable-line no-unused-vars
+  getRootNode(options) {
     if (!this || !this.nodeType) {
@@ -531,3 +582,5 @@ return;
         let parent = this[utils.SHADY_PREFIX + 'parentNode'];
-        root = parent ? parent[utils.SHADY_PREFIX + 'getRootNode'](options) : this;
+        root = parent
+          ? parent[utils.SHADY_PREFIX + 'getRootNode'](options)
+          : this;
         // memo-ize result for performance but only memo-ize
@@ -542,3 +595,2 @@ // result if node is in the document. This avoids a problem where a root
       }
-
     }
@@ -551,4 +603,3 @@ return root;
     return utils.contains(this, node);
-  }
-
+  },
 });

src/patches/ParentNode.js

@@ -21,4 +21,3 @@ /**
   let list = [];
-  queryChildNodes(node, matcher,
-    halter, list);
+  queryChildNodes(node, matcher, halter, list);
   return list;
@@ -28,5 +27,11 @@ }
 function queryChildNodes(parent, matcher, halter, list) {
-  for (let n = parent[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
-    if (n.nodeType === Node.ELEMENT_NODE &&
-        queryElement(n, matcher, halter, list)) {
+  for (
+    let n = parent[utils.SHADY_PREFIX + 'firstChild'];
+    n;
+    n = n[utils.SHADY_PREFIX + 'nextSibling']
+  ) {
+    if (
+      n.nodeType === Node.ELEMENT_NODE &&
+      queryElement(n, matcher, halter, list)
+    ) {
       return true;
@@ -45,4 +50,3 @@ }
   }
-  queryChildNodes(node, matcher,
-    halter, list);
+  queryChildNodes(node, matcher, halter, list);
 }
@@ -52,3 +56,2 @@
 export const ParentNodePatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Element} */
@@ -87,6 +90,7 @@ get firstElementChild() {
     }
-    return utils.createPolyfilledHTMLCollection(Array.prototype.filter.call(
-        utils.childNodesArray(this), (n) => {
-      return (n.nodeType === Node.ELEMENT_NODE);
-    }));
+    return utils.createPolyfilledHTMLCollection(
+      Array.prototype.filter.call(utils.childNodesArray(this), (n) => {
+        return n.nodeType === Node.ELEMENT_NODE;
+      })
+    );
   },
@@ -97,3 +101,3 @@
     let children = this[utils.SHADY_PREFIX + 'children'];
-    if(children) {
+    if (children) {
       return children.length;
@@ -106,3 +110,6 @@ }
   append(...args) {
-    this[utils.SHADY_PREFIX + 'insertBefore'](utils.convertNodesIntoANode(...args), null);
+    this[utils.SHADY_PREFIX + 'insertBefore'](
+      utils.convertNodesIntoANode(...args),
+      null
+    );
   },
@@ -113,3 +120,5 @@
     this[utils.SHADY_PREFIX + 'insertBefore'](
-        utils.convertNodesIntoANode(...args), this[utils.SHADY_PREFIX + 'firstChild']);
+      utils.convertNodesIntoANode(...args),
+      this[utils.SHADY_PREFIX + 'firstChild']
+    );
   },
@@ -123,5 +132,7 @@
     }
-    this[utils.SHADY_PREFIX + 'insertBefore'](utils.convertNodesIntoANode(...args), null);
+    this[utils.SHADY_PREFIX + 'insertBefore'](
+      utils.convertNodesIntoANode(...args),
+      null
+    );
   },
-
 });
@@ -137,7 +148,11 @@
     // match selector and halt on first result.
-    let result = query(this, function(n) {
-      return utils.matchesSelector(n, selector);
-    }, function(n) {
-      return Boolean(n);
-    })[0];
+    let result = query(
+      this,
+      function (n) {
+        return utils.matchesSelector(n, selector);
+      },
+      function (n) {
+        return Boolean(n);
+      }
+    )[0];
     return result || null;
@@ -156,11 +171,16 @@ },
     if (useNative) {
-      const o = Array.prototype.slice.call(this[utils.NATIVE_PREFIX + 'querySelectorAll'](selector));
+      const o = Array.prototype.slice.call(
+        this[utils.NATIVE_PREFIX + 'querySelectorAll'](selector)
+      );
       const root = this[utils.SHADY_PREFIX + 'getRootNode']();
-      return utils.createPolyfilledHTMLCollection(o.filter(e => e[utils.SHADY_PREFIX + 'getRootNode']() == root));
+      return utils.createPolyfilledHTMLCollection(
+        o.filter((e) => e[utils.SHADY_PREFIX + 'getRootNode']() == root)
+      );
     }
-    return utils.createPolyfilledHTMLCollection(query(this, function(n) {
-      return utils.matchesSelector(n, selector);
-    }));
-  }
-
+    return utils.createPolyfilledHTMLCollection(
+      query(this, function (n) {
+        return utils.matchesSelector(n, selector);
+      })
+    );
+  },
 });
@@ -173,5 +193,6 @@
 export const ParentNodeDocumentOrFragmentPatches =
-  (utils.settings.preferPerformance && !utils.settings.noPatch) ?
-  utils.assign({}, ParentNodePatches) : ParentNodePatches;
+  utils.settings.preferPerformance && !utils.settings.noPatch
+    ? utils.assign({}, ParentNodePatches)
+    : ParentNodePatches;
 
 utils.assign(ParentNodePatches, QueryPatches);

src/patches/ShadowRoot.js

@@ -14,3 +14,2 @@ /**
 export const ShadowRootPatches = utils.getOwnPropertyDescriptors({
-
   /**
@@ -25,8 +24,12 @@ * @this {ShadowRoot}
       optionsOrCapture = {
-        capture: Boolean(optionsOrCapture)
-      }
+        capture: Boolean(optionsOrCapture),
+      };
     }
     // Note, `__shadyTarget` may already be set if an event was added on a <slot> child
     optionsOrCapture.__shadyTarget = optionsOrCapture.__shadyTarget || this;
-    this.host[utils.SHADY_PREFIX + 'addEventListener'](type, fn, optionsOrCapture);
+    this.host[utils.SHADY_PREFIX + 'addEventListener'](
+      type,
+      fn,
+      optionsOrCapture
+    );
   },
@@ -43,10 +46,13 @@
       optionsOrCapture = {
-        capture: Boolean(optionsOrCapture)
-      }
+        capture: Boolean(optionsOrCapture),
+      };
     }
     // Note, `__shadyTarget` may already be set if an event was added on a <slot> child
     optionsOrCapture.__shadyTarget = optionsOrCapture.__shadyTarget || this;
-    this.host[utils.SHADY_PREFIX + 'removeEventListener'](type, fn, optionsOrCapture);
-  }
-
+    this.host[utils.SHADY_PREFIX + 'removeEventListener'](
+      type,
+      fn,
+      optionsOrCapture
+    );
+  },
 });

src/patches/Slot.js

@@ -16,3 +16,2 @@ /**
 export const SlotPatches = utils.getOwnPropertyDescriptors({
-
   /**
@@ -31,6 +30,7 @@ * @this {HTMLSlotElement}
       const nodeData = shadyDataForNode(this);
-      return nodeData ?
-        ((options && options.flatten ? nodeData.flattenedNodes :
-          nodeData.assignedNodes) || []) :
-        [];
+      return nodeData
+        ? (options && options.flatten
+            ? nodeData.flattenedNodes
+            : nodeData.assignedNodes) || []
+        : [];
     }
@@ -53,11 +53,17 @@ },
         optionsOrCapture = {
-          capture: Boolean(optionsOrCapture)
-        }
+          capture: Boolean(optionsOrCapture),
+        };
       }
       const parent = this[utils.SHADY_PREFIX + 'parentNode'];
       if (!parent) {
-        throw new Error('ShadyDOM cannot attach event to slot unless it has a `parentNode`');
+        throw new Error(
+          'ShadyDOM cannot attach event to slot unless it has a `parentNode`'
+        );
       }
       optionsOrCapture.__shadyTarget = this;
-      parent[utils.SHADY_PREFIX + 'addEventListener'](type, fn, optionsOrCapture);
+      parent[utils.SHADY_PREFIX + 'addEventListener'](
+        type,
+        fn,
+        optionsOrCapture
+      );
     }
@@ -80,14 +86,19 @@ },
         optionsOrCapture = {
-          capture: Boolean(optionsOrCapture)
-        }
+          capture: Boolean(optionsOrCapture),
+        };
       }
       const parent = this[utils.SHADY_PREFIX + 'parentNode'];
       if (!parent) {
-        throw new Error('ShadyDOM cannot attach event to slot unless it has a `parentNode`');
+        throw new Error(
+          'ShadyDOM cannot attach event to slot unless it has a `parentNode`'
+        );
       }
       optionsOrCapture.__shadyTarget = this;
-      parent[utils.SHADY_PREFIX + 'removeEventListener'](type, fn, optionsOrCapture);
+      parent[utils.SHADY_PREFIX + 'removeEventListener'](
+        type,
+        fn,
+        optionsOrCapture
+      );
     }
-  }
-
+  },
 });

src/patches/Slotable.js

@@ -15,3 +15,2 @@ /**
 export const SlotablePatches = utils.getOwnPropertyDescriptors({
-
   /** @this {Node} */
@@ -27,5 +26,4 @@ get assignedSlot() {
     const nodeData = shadyDataForNode(this);
-    return nodeData && nodeData.assignedSlot || null;
-  }
-
+    return (nodeData && nodeData.assignedSlot) || null;
+  },
 });

src/patches/Window.js

@@ -11,6 +11,6 @@ /**
 import * as utils from '../utils.js';
+// prettier-ignore
 import {addEventListener, removeEventListener, dispatchEvent} from '../patch-events.js';
 
 export const WindowPatches = utils.getOwnPropertyDescriptors({
-
   // Ensure that `dispatchEvent` is patched directly on Window since on
@@ -25,4 +25,3 @@ // IE11, Window does not descend from EventTarget.
 
-  removeEventListener: removeEventListener.bind(window)
-
-});
+  removeEventListener: removeEventListener.bind(window),
+});

src/shady-data.js

@@ -11,5 +11,3 @@ /**
 
-
 export class ShadyData {
-
   /** @override */
@@ -16,0 +14,0 @@ toJSON() {

src/shadydom.js

@@ -23,4 +23,7 @@ /**
 import {flush, enqueue} from './flush.js';
+// prettier-ignore
 import {observeChildren, unobserveChildren, filterMutations} from './observe-changes.js';
+// prettier-ignore
 import {addNativePrefixedProperties, nativeMethods, nativeTree} from './patch-native.js';
+// prettier-ignore
 import {patchInsideElementAccessors, patchOutsideElementAccessors} from './patch-instances.js';
@@ -30,13 +33,14 @@ import {patchEvents, patchClick, composedPath} from './patch-events.js';
 import {wrap, Wrapper} from './wrapper.js';
+// prettier-ignore
 import {addShadyPrefixedProperties, applyPatches, patchShadowOnElement, patchElementProto} from './patch-prototypes.js';
 
-
 if (utils.settings.inUse) {
+  const patch = utils.settings.hasDescriptors
+    ? (n) => n
+    : (node) => {
+        patchInsideElementAccessors(node);
+        patchOutsideElementAccessors(node);
+        return node;
+      };
 
-  const patch = utils.settings.hasDescriptors ? n => n : (node) => {
-    patchInsideElementAccessors(node);
-    patchOutsideElementAccessors(node);
-    return node;
-  };
-
   let ShadyDOM = {
@@ -96,3 +100,3 @@ // TODO(sorvell): remove when Polymer does not depend on this.
     // performance.
-    'wrapIfNeeded': utils.settings.noPatch === true ? wrap : n => n,
+    'wrapIfNeeded': utils.settings.noPatch === true ? wrap : (n) => n,
     'Wrapper': Wrapper,
@@ -119,3 +123,3 @@ 'composedPath': composedPath,
     'nativeTree': nativeTree,
-    'patchElementProto': patchElementProto
+    'patchElementProto': patchElementProto,
   };
@@ -156,3 +160,3 @@
     // Patch click event behavior only if we're patching
-    patchClick()
+    patchClick();
   } else if (utils.settings.patchOnDemand) {
@@ -172,3 +176,3 @@ // In `on-demand` patching, do patch `attachShadow` and `shadowRoot`.
 
-  window.ShadowRoot = /** @type {function(new:ShadowRoot)} */(ShadyRoot);
+  window.ShadowRoot = /** @type {function(new:ShadowRoot)} */ (ShadyRoot);
 }

src/style-scoping.js

@@ -90,5 +90,8 @@ /**
     let correctScope = true;
-    for (let n=node[utils.SHADY_PREFIX + 'firstChild']; n; n = n[utils.SHADY_PREFIX + 'nextSibling']) {
-      correctScope = correctScope &&
-        currentScopeIsCorrect(n, newScopeName);
+    for (
+      let n = node[utils.SHADY_PREFIX + 'firstChild'];
+      n;
+      n = n[utils.SHADY_PREFIX + 'nextSibling']
+    ) {
+      correctScope = correctScope && currentScopeIsCorrect(n, newScopeName);
     }
@@ -133,3 +136,7 @@ return correctScope;
   }
-  for (let n = node[utils.SHADY_PREFIX + 'firstChild']; n; (n = n[utils.SHADY_PREFIX + 'nextSibling'])) {
+  for (
+    let n = node[utils.SHADY_PREFIX + 'firstChild'];
+    n;
+    n = n[utils.SHADY_PREFIX + 'nextSibling']
+  ) {
     if (n.nodeType === Node.ELEMENT_NODE) {
@@ -139,2 +146,2 @@ treeVisitor(n, visitorFn);
   }
-}
+}

src/utils.js

@@ -15,23 +15,26 @@ /**
 
-settings.hasNativeShadowDOM = Boolean(Element.prototype.attachShadow && Node.prototype.getRootNode);
+settings.hasNativeShadowDOM = Boolean(
+  Element.prototype.attachShadow && Node.prototype.getRootNode
+);
 
 // The user might need to pass the custom elements polyfill a flag by setting an
 // object to `customElements`, so check for `customElements.define` also.
-export const hasCustomElements =
-    () => Boolean(window.customElements && window.customElements.define);
+export const hasCustomElements = () =>
+  Boolean(window.customElements && window.customElements.define);
 // The custom elements polyfill is typically loaded after Shady DOM, so this
 // check isn't reliable during initial evaluation. However, because the
 // polyfills are loaded immediately after one another, it works at runtime.
-export const hasPolyfilledCustomElements =
-    () => Boolean(window.customElements && window.customElements['polyfillWrapFlushCallback']);
+export const hasPolyfilledCustomElements = () =>
+  Boolean(
+    window.customElements && window.customElements['polyfillWrapFlushCallback']
+  );
 
 const desc = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild');
 
-/* eslint-disable */
 settings.hasDescriptors = Boolean(desc && desc.configurable && desc.get);
 settings.inUse = settings['force'] || !settings.hasNativeShadowDOM;
-settings.noPatch = /** @type {string|boolean} */(settings['noPatch'] || false);
+settings.noPatch = /** @type {string|boolean} */ (settings['noPatch'] || false);
+// eslint-disable-next-line no-self-assign
 settings.preferPerformance = settings['preferPerformance'];
-settings.patchOnDemand = (settings.noPatch === 'on-demand');
-/* eslint-enable */
+settings.patchOnDemand = settings.noPatch === 'on-demand';
 
@@ -41,2 +44,8 @@ const IS_IE = navigator.userAgent.match('Trident');
 
+// Helper for prefixed properties.
+export const getPropertyName = (obj, name) => {
+  const prefixed = `ms${name[0].toUpperCase() + name.slice(1)}`;
+  return obj[prefixed] ? prefixed : name;
+};
+
 export const canUpgrade = () => !settings.IS_IE;
@@ -46,6 +55,6 @@
   const nodeData = shadyDataForNode(node);
-  return (nodeData && nodeData.firstChild !== undefined);
-}
+  return nodeData && nodeData.firstChild !== undefined;
+};
 
-export const isShadyRoot = obj => obj instanceof ShadowRoot;
+export const isShadyRoot = (obj) => obj instanceof ShadowRoot;
 
@@ -55,13 +64,17 @@ export const hasShadowRootWithSlot = (node) => {
   let root = nodeData && nodeData.root;
-  return (root && root._hasInsertionPoint());
-}
+  return root && root._hasInsertionPoint();
+};
 
 let p = Element.prototype;
-let matches = p.matches || p.matchesSelector ||
-  p.mozMatchesSelector || p.msMatchesSelector ||
-  p.oMatchesSelector || p.webkitMatchesSelector;
+let matches =
+  p.matches ||
+  p.matchesSelector ||
+  p.mozMatchesSelector ||
+  p.msMatchesSelector ||
+  p.oMatchesSelector ||
+  p.webkitMatchesSelector;
 
 export const matchesSelector = (element, selector) => {
   return matches.call(element, selector);
-}
+};
 
@@ -73,3 +86,3 @@ export const mixin = (target, source) => {
   return target;
-}
+};
 
@@ -86,6 +99,6 @@ // NOTE, prefer MutationObserver over Promise for microtask timing
       queue.shift()();
-    } catch(e) {
+    } catch (e) {
       // enqueue another record and throw
       twiddle.textContent = content++;
-      throw(e);
+      throw e;
     }
@@ -99,3 +112,3 @@ }
   twiddle.textContent = content++;
-}
+};
 
@@ -107,6 +120,6 @@ /** @type {function(!Document, !Node): boolean} */
   } else {
-    return (doc, node) => (
+    return (doc, node) =>
       doc === node ||
-      (doc.documentElement && doc.documentElement[NATIVE_PREFIX + 'contains'](node))
-    );
+      (doc.documentElement &&
+        doc.documentElement[NATIVE_PREFIX + 'contains'](node));
   }
@@ -123,6 +136,6 @@ })();
   return false;
-}
+};
 
 const getNodeHTMLCollectionName = (node) =>
-    node.getAttribute('id') || node.getAttribute('name');
+  node.getAttribute('id') || node.getAttribute('name');
 
@@ -141,6 +154,6 @@ const isValidHTMLCollectionName = (name) => name !== 'length' && isNaN(name);
   }
-  nodes.item = function(index) {
+  nodes.item = function (index) {
     return nodes[index];
-  }
-  nodes.namedItem = function(name) {
+  };
+  nodes.namedItem = function (name) {
     if (isValidHTMLCollectionName(name) && nodes[name]) {
@@ -161,3 +174,3 @@ return nodes[name];
   return nodes;
-}
+};
 
@@ -169,15 +182,23 @@ export const NATIVE_PREFIX = '__shady_native_';
   const result = [];
-  for (let n=parent[NATIVE_PREFIX + 'firstChild']; n; n = n[NATIVE_PREFIX + 'nextSibling']) {
+  for (
+    let n = parent[NATIVE_PREFIX + 'firstChild'];
+    n;
+    n = n[NATIVE_PREFIX + 'nextSibling']
+  ) {
     result.push(n);
   }
   return result;
-}
+};
 
 export const childNodesArray = (parent) => {
   const result = [];
-  for (let n=parent[SHADY_PREFIX + 'firstChild']; n; n = n[SHADY_PREFIX + 'nextSibling']) {
+  for (
+    let n = parent[SHADY_PREFIX + 'firstChild'];
+    n;
+    n = n[SHADY_PREFIX + 'nextSibling']
+  ) {
     result.push(n);
   }
   return result;
-}
+};
 
@@ -194,7 +215,7 @@ const patchProperty = (proto, name, descriptor) => {
       Object.defineProperty(proto, name, descriptor);
-    } catch(e) {
+    } catch (e) {
       // this error is harmless so we just trap it.
     }
   }
-}
+};
 
@@ -208,3 +229,8 @@ /**
  */
-export const patchProperties = (proto, descriptors, prefix = '', disallowedPatches) => {
+export const patchProperties = (
+  proto,
+  descriptors,
+  prefix = '',
+  disallowedPatches
+) => {
   for (let name in descriptors) {
@@ -214,5 +240,5 @@ if (disallowedPatches && disallowedPatches.indexOf(name) >= 0) {
     }
-    patchProperty(proto,  prefix + name, descriptors[name]);
+    patchProperty(proto, prefix + name, descriptors[name]);
   }
-}
+};
 
@@ -222,6 +248,6 @@ export const patchExistingProperties = (proto, descriptors) => {
     if (name in proto) {
-      patchProperty(proto,  name, descriptors[name]);
+      patchProperty(proto, name, descriptors[name]);
     }
   }
-}
+};
 
@@ -247,3 +273,3 @@ // note, this is not a perfect polyfill since it doesn't include symbols
 export const arrayFrom = (object) => {
-  return [].slice.call(/** @type {IArrayLike} */(object));
+  return [].slice.call(/** @type {IArrayLike} */ (object));
 };
@@ -261,3 +287,3 @@
   // argument type `(number|string)`.
-  return !(arg instanceof Node) ? document.createTextNode("" + arg) : arg;
+  return !(arg instanceof Node) ? document.createTextNode('' + arg) : arg;
 };
@@ -264,0 +290,0 @@

src/wrapper.js

@@ -12,2 +12,3 @@ /**
 import * as utils from './utils.js';
+// prettier-ignore
 import {eventPropertyNamesForElement, eventPropertyNamesForHTMLElement} from './patch-events.js';
@@ -17,3 +18,2 @@
 class Wrapper {
-
   /** @param {!Node} node */
@@ -26,7 +26,15 @@ constructor(node) {
   addEventListener(name, fn, options) {
-    return this.node[utils.SHADY_PREFIX + 'addEventListener'](name, fn, options);
+    return this.node[utils.SHADY_PREFIX + 'addEventListener'](
+      name,
+      fn,
+      options
+    );
   }
 
   removeEventListener(name, fn, options) {
-    return this.node[utils.SHADY_PREFIX + 'removeEventListener'](name, fn, options);
+    return this.node[utils.SHADY_PREFIX + 'removeEventListener'](
+      name,
+      fn,
+      options
+    );
   }
@@ -91,3 +99,6 @@
   get activeElement() {
-    if (utils.isShadyRoot(this.node) || this.node.nodeType === Node.DOCUMENT_NODE) {
+    if (
+      utils.isShadyRoot(this.node) ||
+      this.node.nodeType === Node.DOCUMENT_NODE
+    ) {
       const e = this.node[utils.SHADY_PREFIX + 'activeElement'];
@@ -133,2 +144,10 @@ return e;
 
+  elementsFromPoint(x, y) {
+    return this.node[utils.SHADY_PREFIX + 'elementsFromPoint'](x, y);
+  }
+
+  elementFromPoint(x, y) {
+    return this.node[utils.SHADY_PREFIX + 'elementFromPoint'](x, y);
+  }
+
   // query
@@ -140,3 +159,6 @@ querySelector(selector) {
   querySelectorAll(selector, useNative) {
-    return this.node[utils.SHADY_PREFIX + 'querySelectorAll'](selector, useNative);
+    return this.node[utils.SHADY_PREFIX + 'querySelectorAll'](
+      selector,
+      useNative
+    );
   }
@@ -153,3 +175,3 @@
     if (utils.isShadyRoot(this.node)) {
-      return /** @type {!ShadowRoot} */(this.node).host;
+      return /** @type {!ShadowRoot} */ (this.node).host;
     }
@@ -252,3 +274,3 @@ return undefined;
   set className(value) {
-    return this.node[utils.SHADY_PREFIX + 'className'] = value;
+    this.node[utils.SHADY_PREFIX + 'className'] = value;
   }
@@ -283,3 +305,2 @@
   }
-
 }
@@ -297,8 +318,10 @@
     },
-    configurable: true
+    configurable: true,
   });
 };
 
-eventPropertyNamesForElement.forEach(name => addEventPropertyWrapper(name));
-eventPropertyNamesForHTMLElement.forEach(name => addEventPropertyWrapper(name));
+eventPropertyNamesForElement.forEach((name) => addEventPropertyWrapper(name));
+eventPropertyNamesForHTMLElement.forEach((name) =>
+  addEventPropertyWrapper(name)
+);
 
@@ -313,3 +336,3 @@ export {Wrapper};
   }
-  let wrapper = wrapperMap.get(obj)
+  let wrapper = wrapperMap.get(obj);
   if (!wrapper) {
@@ -316,0 +339,0 @@ wrapper = new Wrapper(obj);

No alert changes

Improved metrics

Total package byte prevSize

527149

increased by5%

Number of package files

38

increased by2.7%

Lines of code

5463

increased by10.27%

Worsened metrics

Number of lines in readme file

58

decreased by-1.69%

No dependency changes