@oddbird/popover-polyfill - npm Package Compare versions

Comparing version 0.4.0 to 0.4.1

dist/index-fn.d.ts

@@ -33,2 +33,2 @@ interface PopoverToggleTargetElementInvoker {
 }
-export { apply, isSupported } from './popover.js';
+export { apply, isSupported, isPolyfilled } from './popover.js';

dist/popover-fn.js

@@ -139,4 +139,3 @@ // src/events.ts
   let i = 0;
-  const document2 = newPopover.ownerDocument;
-  for (const popover of autoPopoverList.get(document2) || []) {
+  for (const popover of autoPopoverList.get(newPopover.ownerDocument) || []) {
     popoverPositions.set(popover, i);
@@ -157,3 +156,3 @@ i += 1;
   }
-  checkAncestor(newPopover?.parentElement);
+  checkAncestor(newPopover.parentElement || getRootNode(newPopover));
   return topMostPopoverAncestor2;
@@ -385,2 +384,7 @@ }
 }
+function isPolyfilled() {
+  return Boolean(
+    document.body?.showPopover && !/native code/i.test(document.body.showPopover.toString())
+  );
+}
 function patchSelectorFn(object, name, mapper) {
@@ -395,5 +399,9 @@ const original = object[name];
 var nonEscapedPopoverSelector = /(^|[^\\]):popover-open\b/g;
-var hasLayerSupport = typeof window.CSSLayerBlockRule === "function";
-var styles = `
-${hasLayerSupport ? "@layer popover-polyfill {" : ""}
+function hasLayerSupport() {
+  return typeof globalThis.CSSLayerBlockRule === "function";
+}
+function getStyles() {
+  const useLayer = hasLayerSupport();
+  return `
+${useLayer ? "@layer popover-polyfill {" : ""}
   :where([popover]) {
@@ -454,6 +462,8 @@ position: fixed;
   }
-${hasLayerSupport ? "}" : ""}
+${useLayer ? "}" : ""}
 `;
+}
 var popoverStyleSheet = null;
 function injectStyles(root) {
+  const styles = getStyles();
   if (popoverStyleSheet === null) {
@@ -480,3 +490,3 @@ try {
 function apply() {
-  window.ToggleEvent = window.ToggleEvent || ToggleEvent;
+  globalThis.ToggleEvent = globalThis.ToggleEvent || ToggleEvent;
   function rewriteSelector(selector) {
@@ -682,4 +692,5 @@ if (selector?.includes(":popover-open")) {
   apply,
+  isPolyfilled,
   isSupported
 };
 //# sourceMappingURL=popover-fn.js.map

dist/popover.d.ts

 export declare function isSupported(): boolean;
+export declare function isPolyfilled(): boolean;
 export declare function injectStyles(root: Document | ShadowRoot): void;
 export declare function apply(): void;

dist/popover.iife.min.js

@@ -1,3 +0,3 @@
-"use strict";(()=>{var c=class extends Event{oldState;newState;constructor(t,{oldState:o="",newState:r="",...i}={}){super(t,i),this.oldState=String(o||""),this.newState=String(r||"")}},N=new WeakMap;function P(e,t,o){N.set(e,setTimeout(()=>{N.has(e)&&e.dispatchEvent(new c("toggle",{cancelable:!1,oldState:t,newState:o}))},0))}var D=globalThis.ShadowRoot||function(){},U=globalThis.HTMLDialogElement||function(){},M=new WeakMap,p=new WeakMap,h=new WeakMap;function L(e){return h.get(e)||"hidden"}var b=new WeakMap;function B(e){let t=e.popoverTargetElement;if(!(t instanceof HTMLElement))return;let o=L(t);e.popoverTargetAction==="show"&&o==="showing"||e.popoverTargetAction==="hide"&&o==="hidden"||(o==="showing"?m(t,!0,!0):d(t,!1)&&(b.set(t,e),S(t)))}function d(e,t){return!(e.popover!=="auto"&&e.popover!=="manual"||!e.isConnected||t&&L(e)!=="showing"||!t&&L(e)!=="hidden"||e instanceof U&&e.hasAttribute("open")||document.fullscreenElement===e)}function F(e){return e?Array.from(p.get(e.ownerDocument)||[]).indexOf(e)+1:0}function G(e){let t=W(e),o=Q(e);return F(t)>F(o)?t:o}function y(e){let t=p.get(e);for(let o of t||[])if(!o.isConnected)t.delete(o);else return o;return null}function v(e){return typeof e.getRootNode=="function"?e.getRootNode():e.parentNode?v(e.parentNode):e}function W(e){for(;e;){if(e instanceof HTMLElement&&e.popover==="auto"&&h.get(e)==="showing")return e;if(e=e.parentElement||v(e),e instanceof D&&(e=e.host),e instanceof Document)return}}function Q(e){for(;e;){let t=e.popoverTargetElement;if(t instanceof HTMLElement)return t;if(e=e.parentElement||v(e),e instanceof D&&(e=e.host),e instanceof Document)return}}function _(e){let t=new Map,o=0,r=e.ownerDocument;for(let a of p.get(r)||[])t.set(a,o),o+=1;t.set(e,o),o+=1;let i=null;function l(a){let g=W(a);if(g===null)return null;let n=t.get(g);(i===null||t.get(i)<n)&&(i=g)}return l(e?.parentElement),i}function J(e){return e.hidden||e instanceof D||(e instanceof HTMLButtonElement||e instanceof HTMLInputElement||e instanceof HTMLSelectElement||e instanceof HTMLTextAreaElement||e instanceof HTMLOptGroupElement||e instanceof HTMLOptionElement||e instanceof HTMLFieldSetElement)&&e.disabled||e instanceof HTMLInputElement&&e.type==="hidden"||e instanceof HTMLAnchorElement&&e.href===""?!1:typeof e.tabIndex=="number"&&e.tabIndex!==-1}function X(e){if(e.shadowRoot&&e.shadowRoot.delegatesFocus!==!0)return null;let t=e;t.shadowRoot&&(t=t.shadowRoot);let o=t.querySelector("[autofocus]");if(o)return o;{let l=t.querySelectorAll("slot");for(let a of l){let g=a.assignedElements({flatten:!0});for(let n of g){if(n.hasAttribute("autofocus"))return n;if(o=n.querySelector("[autofocus]"),o)return o}}}let r=e.ownerDocument.createTreeWalker(t,NodeFilter.SHOW_ELEMENT),i=r.currentNode;for(;i;){if(J(i))return i;i=r.nextNode()}}function Y(e){X(e)?.focus()}var H=new WeakMap;function S(e){if(!d(e,!1))return;let t=e.ownerDocument;if(!e.dispatchEvent(new c("beforetoggle",{cancelable:!0,oldState:"closed",newState:"open"}))||!d(e,!1))return;let o=!1;if(e.popover==="auto"){let i=e.getAttribute("popover"),l=_(e)||t;if(T(l,!1,!0),i!==e.getAttribute("popover")||!d(e,!1))return}y(t)||(o=!0),H.delete(e);let r=t.activeElement;e.classList.add(":popover-open"),h.set(e,"showing"),M.has(t)||M.set(t,new Set),M.get(t).add(e),Y(e),e.popover==="auto"&&(p.has(t)||p.set(t,new Set),p.get(t).add(e),q(b.get(e),!0)),o&&r&&e.popover==="auto"&&H.set(e,r),P(e,"closed","open")}function m(e,t=!1,o=!1){if(!d(e,!0))return;let r=e.ownerDocument;if(e.popover==="auto"&&(T(e,t,o),!d(e,!0))||(q(b.get(e),!1),b.delete(e),o&&(e.dispatchEvent(new c("beforetoggle",{oldState:"open",newState:"closed"})),!d(e,!0))))return;M.get(r)?.delete(e),p.get(r)?.delete(e),e.classList.remove(":popover-open"),h.set(e,"hidden"),o&&P(e,"open","closed");let i=H.get(e);i&&(H.delete(e),t&&i.focus())}function O(e,t=!1,o=!1){let r=y(e);for(;r;)m(r,t,o),r=y(e)}function T(e,t,o){let r=e.ownerDocument||e;if(e instanceof Document)return O(r,t,o);let i=null,l=!1;for(let a of p.get(r)||[])if(a===e)l=!0;else if(l){i=a;break}if(!l)return O(r,t,o);for(;i&&L(i)==="showing"&&p.get(r)?.size;)m(i,t,o)}var A=new WeakMap;function x(e){if(!e.isTrusted)return;let t=e.composedPath()[0];if(!t)return;let o=t.ownerDocument;if(!y(o))return;let i=G(t);if(i&&e.type==="pointerdown")A.set(o,i);else if(e.type==="pointerup"){let l=A.get(o)===i;A.delete(o),l&&T(i||o,!1,!0)}}var k=new WeakMap;function q(e,t=!1){if(!e)return;k.has(e)||k.set(e,e.getAttribute("aria-expanded"));let o=e.popoverTargetElement;if(o instanceof HTMLElement&&o.popover==="auto")e.setAttribute("aria-expanded",String(t));else{let r=k.get(e);r?e.setAttribute("aria-expanded",r):e.removeAttribute("aria-expanded")}}var C=globalThis.ShadowRoot||function(){};function z(){return typeof HTMLElement<"u"&&typeof HTMLElement.prototype=="object"&&"popover"in HTMLElement.prototype}function f(e,t,o){let r=e[t];Object.defineProperty(e,t,{value(i){return r.call(this,o(i))}})}var Z=/(^|[^\\]):popover-open\b/g,j=typeof window.CSSLayerBlockRule=="function",K=`
-${j?"@layer popover-polyfill {":""}
+"use strict";(()=>{var c=class extends Event{oldState;newState;constructor(t,{oldState:o="",newState:r="",...i}={}){super(t,i),this.oldState=String(o||""),this.newState=String(r||"")}},N=new WeakMap;function P(e,t,o){N.set(e,setTimeout(()=>{N.has(e)&&e.dispatchEvent(new c("toggle",{cancelable:!1,oldState:t,newState:o}))},0))}var x=globalThis.ShadowRoot||function(){},V=globalThis.HTMLDialogElement||function(){},b=new WeakMap,p=new WeakMap,h=new WeakMap;function y(e){return h.get(e)||"hidden"}var L=new WeakMap;function O(e){let t=e.popoverTargetElement;if(!(t instanceof HTMLElement))return;let o=y(t);e.popoverTargetAction==="show"&&o==="showing"||e.popoverTargetAction==="hide"&&o==="hidden"||(o==="showing"?v(t,!0,!0):d(t,!1)&&(L.set(t,e),H(t)))}function d(e,t){return!(e.popover!=="auto"&&e.popover!=="manual"||!e.isConnected||t&&y(e)!=="showing"||!t&&y(e)!=="hidden"||e instanceof V&&e.hasAttribute("open")||document.fullscreenElement===e)}function F(e){return e?Array.from(p.get(e.ownerDocument)||[]).indexOf(e)+1:0}function $(e){let t=W(e),o=U(e);return F(t)>F(o)?t:o}function M(e){let t=p.get(e);for(let o of t||[])if(!o.isConnected)t.delete(o);else return o;return null}function g(e){return typeof e.getRootNode=="function"?e.getRootNode():e.parentNode?g(e.parentNode):e}function W(e){for(;e;){if(e instanceof HTMLElement&&e.popover==="auto"&&h.get(e)==="showing")return e;if(e=e.parentElement||g(e),e instanceof x&&(e=e.host),e instanceof Document)return}}function U(e){for(;e;){let t=e.popoverTargetElement;if(t instanceof HTMLElement)return t;if(e=e.parentElement||g(e),e instanceof x&&(e=e.host),e instanceof Document)return}}function G(e){let t=new Map,o=0;for(let l of p.get(e.ownerDocument)||[])t.set(l,o),o+=1;t.set(e,o),o+=1;let r=null;function i(l){let a=W(l);if(a===null)return null;let w=t.get(a);(r===null||t.get(r)<w)&&(r=a)}return i(e.parentElement||g(e)),r}function Q(e){return e.hidden||e instanceof x||(e instanceof HTMLButtonElement||e instanceof HTMLInputElement||e instanceof HTMLSelectElement||e instanceof HTMLTextAreaElement||e instanceof HTMLOptGroupElement||e instanceof HTMLOptionElement||e instanceof HTMLFieldSetElement)&&e.disabled||e instanceof HTMLInputElement&&e.type==="hidden"||e instanceof HTMLAnchorElement&&e.href===""?!1:typeof e.tabIndex=="number"&&e.tabIndex!==-1}function _(e){if(e.shadowRoot&&e.shadowRoot.delegatesFocus!==!0)return null;let t=e;t.shadowRoot&&(t=t.shadowRoot);let o=t.querySelector("[autofocus]");if(o)return o;{let l=t.querySelectorAll("slot");for(let a of l){let w=a.assignedElements({flatten:!0});for(let n of w){if(n.hasAttribute("autofocus"))return n;if(o=n.querySelector("[autofocus]"),o)return o}}}let r=e.ownerDocument.createTreeWalker(t,NodeFilter.SHOW_ELEMENT),i=r.currentNode;for(;i;){if(Q(i))return i;i=r.nextNode()}}function J(e){_(e)?.focus()}var S=new WeakMap;function H(e){if(!d(e,!1))return;let t=e.ownerDocument;if(!e.dispatchEvent(new c("beforetoggle",{cancelable:!0,oldState:"closed",newState:"open"}))||!d(e,!1))return;let o=!1;if(e.popover==="auto"){let i=e.getAttribute("popover"),l=G(e)||t;if(T(l,!1,!0),i!==e.getAttribute("popover")||!d(e,!1))return}M(t)||(o=!0),S.delete(e);let r=t.activeElement;e.classList.add(":popover-open"),h.set(e,"showing"),b.has(t)||b.set(t,new Set),b.get(t).add(e),J(e),e.popover==="auto"&&(p.has(t)||p.set(t,new Set),p.get(t).add(e),q(L.get(e),!0)),o&&r&&e.popover==="auto"&&S.set(e,r),P(e,"closed","open")}function v(e,t=!1,o=!1){if(!d(e,!0))return;let r=e.ownerDocument;if(e.popover==="auto"&&(T(e,t,o),!d(e,!0))||(q(L.get(e),!1),L.delete(e),o&&(e.dispatchEvent(new c("beforetoggle",{oldState:"open",newState:"closed"})),!d(e,!0))))return;b.get(r)?.delete(e),p.get(r)?.delete(e),e.classList.remove(":popover-open"),h.set(e,"hidden"),o&&P(e,"open","closed");let i=S.get(e);i&&(S.delete(e),t&&i.focus())}function B(e,t=!1,o=!1){let r=M(e);for(;r;)v(r,t,o),r=M(e)}function T(e,t,o){let r=e.ownerDocument||e;if(e instanceof Document)return B(r,t,o);let i=null,l=!1;for(let a of p.get(r)||[])if(a===e)l=!0;else if(l){i=a;break}if(!l)return B(r,t,o);for(;i&&y(i)==="showing"&&p.get(r)?.size;)v(i,t,o)}var A=new WeakMap;function D(e){if(!e.isTrusted)return;let t=e.composedPath()[0];if(!t)return;let o=t.ownerDocument;if(!M(o))return;let i=$(t);if(i&&e.type==="pointerdown")A.set(o,i);else if(e.type==="pointerup"){let l=A.get(o)===i;A.delete(o),l&&T(i||o,!1,!0)}}var k=new WeakMap;function q(e,t=!1){if(!e)return;k.has(e)||k.set(e,e.getAttribute("aria-expanded"));let o=e.popoverTargetElement;if(o instanceof HTMLElement&&o.popover==="auto")e.setAttribute("aria-expanded",String(t));else{let r=k.get(e);r?e.setAttribute("aria-expanded",r):e.removeAttribute("aria-expanded")}}var C=globalThis.ShadowRoot||function(){};function j(){return typeof HTMLElement<"u"&&typeof HTMLElement.prototype=="object"&&"popover"in HTMLElement.prototype}function f(e,t,o){let r=e[t];Object.defineProperty(e,t,{value(i){return r.call(this,o(i))}})}var X=/(^|[^\\]):popover-open\b/g;function Y(){return typeof globalThis.CSSLayerBlockRule=="function"}function Z(){let e=Y();return`
+${e?"@layer popover-polyfill {":""}
   :where([popover]) {
@@ -58,4 +58,4 @@ position: fixed;
   }
-${j?"}":""}
-`,E=null;function I(e){if(E===null)try{E=new CSSStyleSheet,E.replaceSync(K)}catch{E=!1}if(E===!1){let t=document.createElement("style");t.textContent=K,e instanceof Document?e.head.prepend(t):e.prepend(t)}else e.adoptedStyleSheets=[E,...e.adoptedStyleSheets]}function V(){window.ToggleEvent=window.ToggleEvent||c;function e(n){return n?.includes(":popover-open")&&(n=n.replace(Z,"$1.\\:popover-open")),n}f(Document.prototype,"querySelector",e),f(Document.prototype,"querySelectorAll",e),f(Element.prototype,"querySelector",e),f(Element.prototype,"querySelectorAll",e),f(Element.prototype,"matches",e),f(Element.prototype,"closest",e),f(DocumentFragment.prototype,"querySelectorAll",e),f(DocumentFragment.prototype,"querySelectorAll",e),Object.defineProperties(HTMLElement.prototype,{popover:{enumerable:!0,configurable:!0,get(){if(!this.hasAttribute("popover"))return null;let n=(this.getAttribute("popover")||"").toLowerCase();return n===""||n=="auto"?"auto":"manual"},set(n){this.setAttribute("popover",n)}},showPopover:{enumerable:!0,configurable:!0,value(){S(this)}},hidePopover:{enumerable:!0,configurable:!0,value(){m(this,!0,!0)}},togglePopover:{enumerable:!0,configurable:!0,value(n){h.get(this)==="showing"&&n===void 0||n===!1?m(this,!0,!0):(n===void 0||n===!0)&&S(this)}}});let t=Element.prototype.attachShadow;t&&Object.defineProperties(Element.prototype,{attachShadow:{enumerable:!0,configurable:!0,writable:!0,value(n){let s=t.call(this,n);return I(s),s}}});let o=HTMLElement.prototype.attachInternals;o&&Object.defineProperties(HTMLElement.prototype,{attachInternals:{enumerable:!0,configurable:!0,writable:!0,value(){let n=o.call(this);return n.shadowRoot&&I(n.shadowRoot),n}}});let r=new WeakMap;function i(n){Object.defineProperties(n.prototype,{popoverTargetElement:{enumerable:!0,configurable:!0,set(s){if(s===null)this.removeAttribute("popovertarget"),r.delete(this);else if(s instanceof Element)this.setAttribute("popovertarget",""),r.set(this,s);else throw new TypeError("popoverTargetElement must be an element or null")},get(){if(this.localName!=="button"&&this.localName!=="input"||this.localName==="input"&&this.type!=="reset"&&this.type!=="image"&&this.type!=="button"||this.disabled||this.form&&this.type==="submit")return null;let s=r.get(this);if(s&&s.isConnected)return s;if(s&&!s.isConnected)return r.delete(this),null;let u=v(this),w=this.getAttribute("popovertarget");return(u instanceof Document||u instanceof C)&&w&&u.getElementById(w)||null}},popoverTargetAction:{enumerable:!0,configurable:!0,get(){let s=(this.getAttribute("popovertargetaction")||"").toLowerCase();return s==="show"||s==="hide"?s:"toggle"},set(s){this.setAttribute("popovertargetaction",s)}}})}i(HTMLButtonElement),i(HTMLInputElement);let l=n=>{let s=n.composedPath(),u=s[0];if(!(u instanceof Element)||u?.shadowRoot)return;let w=v(u);if(!(w instanceof C||w instanceof Document))return;let R=s.find($=>$.matches?.("[popovertargetaction],[popovertarget]"));if(R){B(R),n.preventDefault();return}},a=n=>{let s=n.key,u=n.target;!n.defaultPrevented&&u&&(s==="Escape"||s==="Esc")&&T(u.ownerDocument,!0,!0)};(n=>{n.addEventListener("click",l),n.addEventListener("keydown",a),n.addEventListener("pointerdown",x),n.addEventListener("pointerup",x)})(document),I(document)}z()||V();})();
+${e?"}":""}
+`}var m=null;function I(e){let t=Z();if(m===null)try{m=new CSSStyleSheet,m.replaceSync(t)}catch{m=!1}if(m===!1){let o=document.createElement("style");o.textContent=t,e instanceof Document?e.head.prepend(o):e.prepend(o)}else e.adoptedStyleSheets=[m,...e.adoptedStyleSheets]}function K(){globalThis.ToggleEvent=globalThis.ToggleEvent||c;function e(n){return n?.includes(":popover-open")&&(n=n.replace(X,"$1.\\:popover-open")),n}f(Document.prototype,"querySelector",e),f(Document.prototype,"querySelectorAll",e),f(Element.prototype,"querySelector",e),f(Element.prototype,"querySelectorAll",e),f(Element.prototype,"matches",e),f(Element.prototype,"closest",e),f(DocumentFragment.prototype,"querySelectorAll",e),f(DocumentFragment.prototype,"querySelectorAll",e),Object.defineProperties(HTMLElement.prototype,{popover:{enumerable:!0,configurable:!0,get(){if(!this.hasAttribute("popover"))return null;let n=(this.getAttribute("popover")||"").toLowerCase();return n===""||n=="auto"?"auto":"manual"},set(n){this.setAttribute("popover",n)}},showPopover:{enumerable:!0,configurable:!0,value(){H(this)}},hidePopover:{enumerable:!0,configurable:!0,value(){v(this,!0,!0)}},togglePopover:{enumerable:!0,configurable:!0,value(n){h.get(this)==="showing"&&n===void 0||n===!1?v(this,!0,!0):(n===void 0||n===!0)&&H(this)}}});let t=Element.prototype.attachShadow;t&&Object.defineProperties(Element.prototype,{attachShadow:{enumerable:!0,configurable:!0,writable:!0,value(n){let s=t.call(this,n);return I(s),s}}});let o=HTMLElement.prototype.attachInternals;o&&Object.defineProperties(HTMLElement.prototype,{attachInternals:{enumerable:!0,configurable:!0,writable:!0,value(){let n=o.call(this);return n.shadowRoot&&I(n.shadowRoot),n}}});let r=new WeakMap;function i(n){Object.defineProperties(n.prototype,{popoverTargetElement:{enumerable:!0,configurable:!0,set(s){if(s===null)this.removeAttribute("popovertarget"),r.delete(this);else if(s instanceof Element)this.setAttribute("popovertarget",""),r.set(this,s);else throw new TypeError("popoverTargetElement must be an element or null")},get(){if(this.localName!=="button"&&this.localName!=="input"||this.localName==="input"&&this.type!=="reset"&&this.type!=="image"&&this.type!=="button"||this.disabled||this.form&&this.type==="submit")return null;let s=r.get(this);if(s&&s.isConnected)return s;if(s&&!s.isConnected)return r.delete(this),null;let u=g(this),E=this.getAttribute("popovertarget");return(u instanceof Document||u instanceof C)&&E&&u.getElementById(E)||null}},popoverTargetAction:{enumerable:!0,configurable:!0,get(){let s=(this.getAttribute("popovertargetaction")||"").toLowerCase();return s==="show"||s==="hide"?s:"toggle"},set(s){this.setAttribute("popovertargetaction",s)}}})}i(HTMLButtonElement),i(HTMLInputElement);let l=n=>{let s=n.composedPath(),u=s[0];if(!(u instanceof Element)||u?.shadowRoot)return;let E=g(u);if(!(E instanceof C||E instanceof Document))return;let R=s.find(z=>z.matches?.("[popovertargetaction],[popovertarget]"));if(R){O(R),n.preventDefault();return}},a=n=>{let s=n.key,u=n.target;!n.defaultPrevented&&u&&(s==="Escape"||s==="Esc")&&T(u.ownerDocument,!0,!0)};(n=>{n.addEventListener("click",l),n.addEventListener("keydown",a),n.addEventListener("pointerdown",D),n.addEventListener("pointerup",D)})(document),I(document)}j()||K();})();
 //# sourceMappingURL=popover.iife.min.js.map

dist/popover.js

@@ -139,4 +139,3 @@ // src/events.ts
   let i = 0;
-  const document2 = newPopover.ownerDocument;
-  for (const popover of autoPopoverList.get(document2) || []) {
+  for (const popover of autoPopoverList.get(newPopover.ownerDocument) || []) {
     popoverPositions.set(popover, i);
@@ -157,3 +156,3 @@ i += 1;
   }
-  checkAncestor(newPopover?.parentElement);
+  checkAncestor(newPopover.parentElement || getRootNode(newPopover));
   return topMostPopoverAncestor2;
@@ -394,5 +393,9 @@ }
 var nonEscapedPopoverSelector = /(^|[^\\]):popover-open\b/g;
-var hasLayerSupport = typeof window.CSSLayerBlockRule === "function";
-var styles = `
-${hasLayerSupport ? "@layer popover-polyfill {" : ""}
+function hasLayerSupport() {
+  return typeof globalThis.CSSLayerBlockRule === "function";
+}
+function getStyles() {
+  const useLayer = hasLayerSupport();
+  return `
+${useLayer ? "@layer popover-polyfill {" : ""}
   :where([popover]) {
@@ -453,6 +456,8 @@ position: fixed;
   }
-${hasLayerSupport ? "}" : ""}
+${useLayer ? "}" : ""}
 `;
+}
 var popoverStyleSheet = null;
 function injectStyles(root) {
+  const styles = getStyles();
   if (popoverStyleSheet === null) {
@@ -479,3 +484,3 @@ try {
 function apply() {
-  window.ToggleEvent = window.ToggleEvent || ToggleEvent;
+  globalThis.ToggleEvent = globalThis.ToggleEvent || ToggleEvent;
   function rewriteSelector(selector) {
@@ -482,0 +487,0 @@ if (selector?.includes(":popover-open")) {

dist/popover.min.js

@@ -1,3 +0,3 @@
-var c=class extends Event{oldState;newState;constructor(t,{oldState:o="",newState:r="",...i}={}){super(t,i),this.oldState=String(o||""),this.newState=String(r||"")}},N=new WeakMap;function P(e,t,o){N.set(e,setTimeout(()=>{N.has(e)&&e.dispatchEvent(new c("toggle",{cancelable:!1,oldState:t,newState:o}))},0))}var D=globalThis.ShadowRoot||function(){},U=globalThis.HTMLDialogElement||function(){},M=new WeakMap,p=new WeakMap,h=new WeakMap;function L(e){return h.get(e)||"hidden"}var b=new WeakMap;function B(e){let t=e.popoverTargetElement;if(!(t instanceof HTMLElement))return;let o=L(t);e.popoverTargetAction==="show"&&o==="showing"||e.popoverTargetAction==="hide"&&o==="hidden"||(o==="showing"?m(t,!0,!0):d(t,!1)&&(b.set(t,e),S(t)))}function d(e,t){return!(e.popover!=="auto"&&e.popover!=="manual"||!e.isConnected||t&&L(e)!=="showing"||!t&&L(e)!=="hidden"||e instanceof U&&e.hasAttribute("open")||document.fullscreenElement===e)}function F(e){return e?Array.from(p.get(e.ownerDocument)||[]).indexOf(e)+1:0}function G(e){let t=W(e),o=Q(e);return F(t)>F(o)?t:o}function y(e){let t=p.get(e);for(let o of t||[])if(!o.isConnected)t.delete(o);else return o;return null}function v(e){return typeof e.getRootNode=="function"?e.getRootNode():e.parentNode?v(e.parentNode):e}function W(e){for(;e;){if(e instanceof HTMLElement&&e.popover==="auto"&&h.get(e)==="showing")return e;if(e=e.parentElement||v(e),e instanceof D&&(e=e.host),e instanceof Document)return}}function Q(e){for(;e;){let t=e.popoverTargetElement;if(t instanceof HTMLElement)return t;if(e=e.parentElement||v(e),e instanceof D&&(e=e.host),e instanceof Document)return}}function _(e){let t=new Map,o=0,r=e.ownerDocument;for(let a of p.get(r)||[])t.set(a,o),o+=1;t.set(e,o),o+=1;let i=null;function l(a){let g=W(a);if(g===null)return null;let n=t.get(g);(i===null||t.get(i)<n)&&(i=g)}return l(e?.parentElement),i}function J(e){return e.hidden||e instanceof D||(e instanceof HTMLButtonElement||e instanceof HTMLInputElement||e instanceof HTMLSelectElement||e instanceof HTMLTextAreaElement||e instanceof HTMLOptGroupElement||e instanceof HTMLOptionElement||e instanceof HTMLFieldSetElement)&&e.disabled||e instanceof HTMLInputElement&&e.type==="hidden"||e instanceof HTMLAnchorElement&&e.href===""?!1:typeof e.tabIndex=="number"&&e.tabIndex!==-1}function X(e){if(e.shadowRoot&&e.shadowRoot.delegatesFocus!==!0)return null;let t=e;t.shadowRoot&&(t=t.shadowRoot);let o=t.querySelector("[autofocus]");if(o)return o;{let l=t.querySelectorAll("slot");for(let a of l){let g=a.assignedElements({flatten:!0});for(let n of g){if(n.hasAttribute("autofocus"))return n;if(o=n.querySelector("[autofocus]"),o)return o}}}let r=e.ownerDocument.createTreeWalker(t,NodeFilter.SHOW_ELEMENT),i=r.currentNode;for(;i;){if(J(i))return i;i=r.nextNode()}}function Y(e){X(e)?.focus()}var H=new WeakMap;function S(e){if(!d(e,!1))return;let t=e.ownerDocument;if(!e.dispatchEvent(new c("beforetoggle",{cancelable:!0,oldState:"closed",newState:"open"}))||!d(e,!1))return;let o=!1;if(e.popover==="auto"){let i=e.getAttribute("popover"),l=_(e)||t;if(T(l,!1,!0),i!==e.getAttribute("popover")||!d(e,!1))return}y(t)||(o=!0),H.delete(e);let r=t.activeElement;e.classList.add(":popover-open"),h.set(e,"showing"),M.has(t)||M.set(t,new Set),M.get(t).add(e),Y(e),e.popover==="auto"&&(p.has(t)||p.set(t,new Set),p.get(t).add(e),q(b.get(e),!0)),o&&r&&e.popover==="auto"&&H.set(e,r),P(e,"closed","open")}function m(e,t=!1,o=!1){if(!d(e,!0))return;let r=e.ownerDocument;if(e.popover==="auto"&&(T(e,t,o),!d(e,!0))||(q(b.get(e),!1),b.delete(e),o&&(e.dispatchEvent(new c("beforetoggle",{oldState:"open",newState:"closed"})),!d(e,!0))))return;M.get(r)?.delete(e),p.get(r)?.delete(e),e.classList.remove(":popover-open"),h.set(e,"hidden"),o&&P(e,"open","closed");let i=H.get(e);i&&(H.delete(e),t&&i.focus())}function O(e,t=!1,o=!1){let r=y(e);for(;r;)m(r,t,o),r=y(e)}function T(e,t,o){let r=e.ownerDocument||e;if(e instanceof Document)return O(r,t,o);let i=null,l=!1;for(let a of p.get(r)||[])if(a===e)l=!0;else if(l){i=a;break}if(!l)return O(r,t,o);for(;i&&L(i)==="showing"&&p.get(r)?.size;)m(i,t,o)}var A=new WeakMap;function x(e){if(!e.isTrusted)return;let t=e.composedPath()[0];if(!t)return;let o=t.ownerDocument;if(!y(o))return;let i=G(t);if(i&&e.type==="pointerdown")A.set(o,i);else if(e.type==="pointerup"){let l=A.get(o)===i;A.delete(o),l&&T(i||o,!1,!0)}}var k=new WeakMap;function q(e,t=!1){if(!e)return;k.has(e)||k.set(e,e.getAttribute("aria-expanded"));let o=e.popoverTargetElement;if(o instanceof HTMLElement&&o.popover==="auto")e.setAttribute("aria-expanded",String(t));else{let r=k.get(e);r?e.setAttribute("aria-expanded",r):e.removeAttribute("aria-expanded")}}var C=globalThis.ShadowRoot||function(){};function z(){return typeof HTMLElement<"u"&&typeof HTMLElement.prototype=="object"&&"popover"in HTMLElement.prototype}function f(e,t,o){let r=e[t];Object.defineProperty(e,t,{value(i){return r.call(this,o(i))}})}var Z=/(^|[^\\]):popover-open\b/g,j=typeof window.CSSLayerBlockRule=="function",K=`
-${j?"@layer popover-polyfill {":""}
+var c=class extends Event{oldState;newState;constructor(t,{oldState:o="",newState:r="",...i}={}){super(t,i),this.oldState=String(o||""),this.newState=String(r||"")}},N=new WeakMap;function P(e,t,o){N.set(e,setTimeout(()=>{N.has(e)&&e.dispatchEvent(new c("toggle",{cancelable:!1,oldState:t,newState:o}))},0))}var x=globalThis.ShadowRoot||function(){},V=globalThis.HTMLDialogElement||function(){},b=new WeakMap,p=new WeakMap,h=new WeakMap;function y(e){return h.get(e)||"hidden"}var L=new WeakMap;function O(e){let t=e.popoverTargetElement;if(!(t instanceof HTMLElement))return;let o=y(t);e.popoverTargetAction==="show"&&o==="showing"||e.popoverTargetAction==="hide"&&o==="hidden"||(o==="showing"?v(t,!0,!0):d(t,!1)&&(L.set(t,e),H(t)))}function d(e,t){return!(e.popover!=="auto"&&e.popover!=="manual"||!e.isConnected||t&&y(e)!=="showing"||!t&&y(e)!=="hidden"||e instanceof V&&e.hasAttribute("open")||document.fullscreenElement===e)}function F(e){return e?Array.from(p.get(e.ownerDocument)||[]).indexOf(e)+1:0}function $(e){let t=W(e),o=U(e);return F(t)>F(o)?t:o}function M(e){let t=p.get(e);for(let o of t||[])if(!o.isConnected)t.delete(o);else return o;return null}function g(e){return typeof e.getRootNode=="function"?e.getRootNode():e.parentNode?g(e.parentNode):e}function W(e){for(;e;){if(e instanceof HTMLElement&&e.popover==="auto"&&h.get(e)==="showing")return e;if(e=e.parentElement||g(e),e instanceof x&&(e=e.host),e instanceof Document)return}}function U(e){for(;e;){let t=e.popoverTargetElement;if(t instanceof HTMLElement)return t;if(e=e.parentElement||g(e),e instanceof x&&(e=e.host),e instanceof Document)return}}function G(e){let t=new Map,o=0;for(let l of p.get(e.ownerDocument)||[])t.set(l,o),o+=1;t.set(e,o),o+=1;let r=null;function i(l){let a=W(l);if(a===null)return null;let w=t.get(a);(r===null||t.get(r)<w)&&(r=a)}return i(e.parentElement||g(e)),r}function Q(e){return e.hidden||e instanceof x||(e instanceof HTMLButtonElement||e instanceof HTMLInputElement||e instanceof HTMLSelectElement||e instanceof HTMLTextAreaElement||e instanceof HTMLOptGroupElement||e instanceof HTMLOptionElement||e instanceof HTMLFieldSetElement)&&e.disabled||e instanceof HTMLInputElement&&e.type==="hidden"||e instanceof HTMLAnchorElement&&e.href===""?!1:typeof e.tabIndex=="number"&&e.tabIndex!==-1}function _(e){if(e.shadowRoot&&e.shadowRoot.delegatesFocus!==!0)return null;let t=e;t.shadowRoot&&(t=t.shadowRoot);let o=t.querySelector("[autofocus]");if(o)return o;{let l=t.querySelectorAll("slot");for(let a of l){let w=a.assignedElements({flatten:!0});for(let n of w){if(n.hasAttribute("autofocus"))return n;if(o=n.querySelector("[autofocus]"),o)return o}}}let r=e.ownerDocument.createTreeWalker(t,NodeFilter.SHOW_ELEMENT),i=r.currentNode;for(;i;){if(Q(i))return i;i=r.nextNode()}}function J(e){_(e)?.focus()}var S=new WeakMap;function H(e){if(!d(e,!1))return;let t=e.ownerDocument;if(!e.dispatchEvent(new c("beforetoggle",{cancelable:!0,oldState:"closed",newState:"open"}))||!d(e,!1))return;let o=!1;if(e.popover==="auto"){let i=e.getAttribute("popover"),l=G(e)||t;if(T(l,!1,!0),i!==e.getAttribute("popover")||!d(e,!1))return}M(t)||(o=!0),S.delete(e);let r=t.activeElement;e.classList.add(":popover-open"),h.set(e,"showing"),b.has(t)||b.set(t,new Set),b.get(t).add(e),J(e),e.popover==="auto"&&(p.has(t)||p.set(t,new Set),p.get(t).add(e),q(L.get(e),!0)),o&&r&&e.popover==="auto"&&S.set(e,r),P(e,"closed","open")}function v(e,t=!1,o=!1){if(!d(e,!0))return;let r=e.ownerDocument;if(e.popover==="auto"&&(T(e,t,o),!d(e,!0))||(q(L.get(e),!1),L.delete(e),o&&(e.dispatchEvent(new c("beforetoggle",{oldState:"open",newState:"closed"})),!d(e,!0))))return;b.get(r)?.delete(e),p.get(r)?.delete(e),e.classList.remove(":popover-open"),h.set(e,"hidden"),o&&P(e,"open","closed");let i=S.get(e);i&&(S.delete(e),t&&i.focus())}function B(e,t=!1,o=!1){let r=M(e);for(;r;)v(r,t,o),r=M(e)}function T(e,t,o){let r=e.ownerDocument||e;if(e instanceof Document)return B(r,t,o);let i=null,l=!1;for(let a of p.get(r)||[])if(a===e)l=!0;else if(l){i=a;break}if(!l)return B(r,t,o);for(;i&&y(i)==="showing"&&p.get(r)?.size;)v(i,t,o)}var A=new WeakMap;function D(e){if(!e.isTrusted)return;let t=e.composedPath()[0];if(!t)return;let o=t.ownerDocument;if(!M(o))return;let i=$(t);if(i&&e.type==="pointerdown")A.set(o,i);else if(e.type==="pointerup"){let l=A.get(o)===i;A.delete(o),l&&T(i||o,!1,!0)}}var k=new WeakMap;function q(e,t=!1){if(!e)return;k.has(e)||k.set(e,e.getAttribute("aria-expanded"));let o=e.popoverTargetElement;if(o instanceof HTMLElement&&o.popover==="auto")e.setAttribute("aria-expanded",String(t));else{let r=k.get(e);r?e.setAttribute("aria-expanded",r):e.removeAttribute("aria-expanded")}}var C=globalThis.ShadowRoot||function(){};function j(){return typeof HTMLElement<"u"&&typeof HTMLElement.prototype=="object"&&"popover"in HTMLElement.prototype}function f(e,t,o){let r=e[t];Object.defineProperty(e,t,{value(i){return r.call(this,o(i))}})}var X=/(^|[^\\]):popover-open\b/g;function Y(){return typeof globalThis.CSSLayerBlockRule=="function"}function Z(){let e=Y();return`
+${e?"@layer popover-polyfill {":""}
   :where([popover]) {
@@ -58,4 +58,4 @@ position: fixed;
   }
-${j?"}":""}
-`,E=null;function I(e){if(E===null)try{E=new CSSStyleSheet,E.replaceSync(K)}catch{E=!1}if(E===!1){let t=document.createElement("style");t.textContent=K,e instanceof Document?e.head.prepend(t):e.prepend(t)}else e.adoptedStyleSheets=[E,...e.adoptedStyleSheets]}function V(){window.ToggleEvent=window.ToggleEvent||c;function e(n){return n?.includes(":popover-open")&&(n=n.replace(Z,"$1.\\:popover-open")),n}f(Document.prototype,"querySelector",e),f(Document.prototype,"querySelectorAll",e),f(Element.prototype,"querySelector",e),f(Element.prototype,"querySelectorAll",e),f(Element.prototype,"matches",e),f(Element.prototype,"closest",e),f(DocumentFragment.prototype,"querySelectorAll",e),f(DocumentFragment.prototype,"querySelectorAll",e),Object.defineProperties(HTMLElement.prototype,{popover:{enumerable:!0,configurable:!0,get(){if(!this.hasAttribute("popover"))return null;let n=(this.getAttribute("popover")||"").toLowerCase();return n===""||n=="auto"?"auto":"manual"},set(n){this.setAttribute("popover",n)}},showPopover:{enumerable:!0,configurable:!0,value(){S(this)}},hidePopover:{enumerable:!0,configurable:!0,value(){m(this,!0,!0)}},togglePopover:{enumerable:!0,configurable:!0,value(n){h.get(this)==="showing"&&n===void 0||n===!1?m(this,!0,!0):(n===void 0||n===!0)&&S(this)}}});let t=Element.prototype.attachShadow;t&&Object.defineProperties(Element.prototype,{attachShadow:{enumerable:!0,configurable:!0,writable:!0,value(n){let s=t.call(this,n);return I(s),s}}});let o=HTMLElement.prototype.attachInternals;o&&Object.defineProperties(HTMLElement.prototype,{attachInternals:{enumerable:!0,configurable:!0,writable:!0,value(){let n=o.call(this);return n.shadowRoot&&I(n.shadowRoot),n}}});let r=new WeakMap;function i(n){Object.defineProperties(n.prototype,{popoverTargetElement:{enumerable:!0,configurable:!0,set(s){if(s===null)this.removeAttribute("popovertarget"),r.delete(this);else if(s instanceof Element)this.setAttribute("popovertarget",""),r.set(this,s);else throw new TypeError("popoverTargetElement must be an element or null")},get(){if(this.localName!=="button"&&this.localName!=="input"||this.localName==="input"&&this.type!=="reset"&&this.type!=="image"&&this.type!=="button"||this.disabled||this.form&&this.type==="submit")return null;let s=r.get(this);if(s&&s.isConnected)return s;if(s&&!s.isConnected)return r.delete(this),null;let u=v(this),w=this.getAttribute("popovertarget");return(u instanceof Document||u instanceof C)&&w&&u.getElementById(w)||null}},popoverTargetAction:{enumerable:!0,configurable:!0,get(){let s=(this.getAttribute("popovertargetaction")||"").toLowerCase();return s==="show"||s==="hide"?s:"toggle"},set(s){this.setAttribute("popovertargetaction",s)}}})}i(HTMLButtonElement),i(HTMLInputElement);let l=n=>{let s=n.composedPath(),u=s[0];if(!(u instanceof Element)||u?.shadowRoot)return;let w=v(u);if(!(w instanceof C||w instanceof Document))return;let R=s.find($=>$.matches?.("[popovertargetaction],[popovertarget]"));if(R){B(R),n.preventDefault();return}},a=n=>{let s=n.key,u=n.target;!n.defaultPrevented&&u&&(s==="Escape"||s==="Esc")&&T(u.ownerDocument,!0,!0)};(n=>{n.addEventListener("click",l),n.addEventListener("keydown",a),n.addEventListener("pointerdown",x),n.addEventListener("pointerup",x)})(document),I(document)}z()||V();
+${e?"}":""}
+`}var m=null;function I(e){let t=Z();if(m===null)try{m=new CSSStyleSheet,m.replaceSync(t)}catch{m=!1}if(m===!1){let o=document.createElement("style");o.textContent=t,e instanceof Document?e.head.prepend(o):e.prepend(o)}else e.adoptedStyleSheets=[m,...e.adoptedStyleSheets]}function K(){globalThis.ToggleEvent=globalThis.ToggleEvent||c;function e(n){return n?.includes(":popover-open")&&(n=n.replace(X,"$1.\\:popover-open")),n}f(Document.prototype,"querySelector",e),f(Document.prototype,"querySelectorAll",e),f(Element.prototype,"querySelector",e),f(Element.prototype,"querySelectorAll",e),f(Element.prototype,"matches",e),f(Element.prototype,"closest",e),f(DocumentFragment.prototype,"querySelectorAll",e),f(DocumentFragment.prototype,"querySelectorAll",e),Object.defineProperties(HTMLElement.prototype,{popover:{enumerable:!0,configurable:!0,get(){if(!this.hasAttribute("popover"))return null;let n=(this.getAttribute("popover")||"").toLowerCase();return n===""||n=="auto"?"auto":"manual"},set(n){this.setAttribute("popover",n)}},showPopover:{enumerable:!0,configurable:!0,value(){H(this)}},hidePopover:{enumerable:!0,configurable:!0,value(){v(this,!0,!0)}},togglePopover:{enumerable:!0,configurable:!0,value(n){h.get(this)==="showing"&&n===void 0||n===!1?v(this,!0,!0):(n===void 0||n===!0)&&H(this)}}});let t=Element.prototype.attachShadow;t&&Object.defineProperties(Element.prototype,{attachShadow:{enumerable:!0,configurable:!0,writable:!0,value(n){let s=t.call(this,n);return I(s),s}}});let o=HTMLElement.prototype.attachInternals;o&&Object.defineProperties(HTMLElement.prototype,{attachInternals:{enumerable:!0,configurable:!0,writable:!0,value(){let n=o.call(this);return n.shadowRoot&&I(n.shadowRoot),n}}});let r=new WeakMap;function i(n){Object.defineProperties(n.prototype,{popoverTargetElement:{enumerable:!0,configurable:!0,set(s){if(s===null)this.removeAttribute("popovertarget"),r.delete(this);else if(s instanceof Element)this.setAttribute("popovertarget",""),r.set(this,s);else throw new TypeError("popoverTargetElement must be an element or null")},get(){if(this.localName!=="button"&&this.localName!=="input"||this.localName==="input"&&this.type!=="reset"&&this.type!=="image"&&this.type!=="button"||this.disabled||this.form&&this.type==="submit")return null;let s=r.get(this);if(s&&s.isConnected)return s;if(s&&!s.isConnected)return r.delete(this),null;let u=g(this),E=this.getAttribute("popovertarget");return(u instanceof Document||u instanceof C)&&E&&u.getElementById(E)||null}},popoverTargetAction:{enumerable:!0,configurable:!0,get(){let s=(this.getAttribute("popovertargetaction")||"").toLowerCase();return s==="show"||s==="hide"?s:"toggle"},set(s){this.setAttribute("popovertargetaction",s)}}})}i(HTMLButtonElement),i(HTMLInputElement);let l=n=>{let s=n.composedPath(),u=s[0];if(!(u instanceof Element)||u?.shadowRoot)return;let E=g(u);if(!(E instanceof C||E instanceof Document))return;let R=s.find(z=>z.matches?.("[popovertargetaction],[popovertarget]"));if(R){O(R),n.preventDefault();return}},a=n=>{let s=n.key,u=n.target;!n.defaultPrevented&&u&&(s==="Escape"||s==="Esc")&&T(u.ownerDocument,!0,!0)};(n=>{n.addEventListener("click",l),n.addEventListener("keydown",a),n.addEventListener("pointerdown",D),n.addEventListener("pointerup",D)})(document),I(document)}j()||K();
 //# sourceMappingURL=popover.min.js.map

package.json

 {
   "name": "@oddbird/popover-polyfill",
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "Popover Attribute Polyfill",
@@ -77,5 +77,5 @@ "license": "BSD-3-Clause",
     "lint": "run-p lint:*",
-    "test:unit": "playwright test",
-    "test:e2e": "echo No e2e tests yet",
-    "test:e2e:ci": "echo No e2e tests yet",
+    "test:unit": "echo No unit tests yet",
+    "test:e2e": "playwright test",
+    "test:e2e:ci": "run-s test:e2e \"test:e2e -- --browser=firefox\"",
     "test": "run-p test:unit test:e2e",
@@ -89,11 +89,11 @@ "test:ci": "run-p test:unit test:e2e:ci",
     "@types/node": "*",
-    "@typescript-eslint/eslint-plugin": "^6.21.0",
-    "@typescript-eslint/parser": "^6.21.0",
-    "esbuild": "^0.20.0",
-    "eslint": "^8.56.0",
+    "@typescript-eslint/eslint-plugin": "^7.4.0",
+    "@typescript-eslint/parser": "^7.4.0",
+    "esbuild": "^0.20.2",
+    "eslint": "^8.57.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-import-resolver-typescript": "^3.6.1",
     "eslint-plugin-import": "^2.29.1",
-    "eslint-plugin-simple-import-sort": "^10.0.0",
-    "husky": "^9.0.10",
+    "eslint-plugin-simple-import-sort": "^12.0.0",
+    "husky": "^9.0.11",
     "lint-staged": "^15.2.2",
@@ -103,3 +103,3 @@ "npm-run-all": "^4.1.5",
     "ts-node": "^10.9.2",
-    "typescript": "^5.2.2"
+    "typescript": "^5.4.3"
   },
@@ -109,8 +109,8 @@ "lint-staged": {
       "eslint --cache --fix",
-      "prettier --write"
+      "prettier --write --ignore-unknown"
     ],
     "*.{json,yml,md,html}": [
-      "prettier --write"
+      "prettier --write --ignore-unknown"
     ]
   }
 }

README.md

@@ -64,2 +64,8 @@ # Popover Attribute Polyfill
 
+A special `isPolyfilled` function is also available, to detect if the Popover methods have been polyfilled:
+
+```js
+import { isPolyfilled } from '@oddbird/popover-polyfill/fn';
+```
+
 ### Via CDN
@@ -146,2 +152,14 @@
 
+  - Given that the CSS is injected using JavaScript, you may find that you
+    temporarily see popovers as open while the JS is loading. To work around
+    this, you can add the following CSS to your project:
+
+    ```css
+    @supports not selector(:popover-open) {
+      [popover]:not(.\:popover-open) {
+        display: none;
+      }
+    }
+    ```
+
 - When supported, the polyfill creates a cascade layer named `popover-polyfill`.
@@ -148,0 +166,0 @@ If your styles are not in layers then this should have no impact. If your

src/index-fn.ts

@@ -38,2 +38,2 @@ interface PopoverToggleTargetElementInvoker {
 
-export { apply, isSupported } from './popover.js';
+export { apply, isSupported, isPolyfilled } from './popover.js';

src/popover-helpers.ts

@@ -139,4 +139,3 @@ import { queuePopoverToggleEventTask, ToggleEvent } from './events.js';
   let i = 0;
-  const document = newPopover.ownerDocument;
-  for (const popover of autoPopoverList.get(document) || []) {
+  for (const popover of autoPopoverList.get(newPopover.ownerDocument) || []) {
     popoverPositions.set(popover, i);
@@ -148,3 +147,3 @@ i += 1;
   let topMostPopoverAncestor: HTMLElement | null = null;
-  function checkAncestor(candidate: HTMLElement | null) {
+  function checkAncestor(candidate: Node | null) {
     const candidateAncestor = nearestInclusiveOpenPopover(candidate);
@@ -160,3 +159,3 @@ if (candidateAncestor === null) return null;
   }
-  checkAncestor(newPopover?.parentElement);
+  checkAncestor(newPopover.parentElement || getRootNode(newPopover));
   return topMostPopoverAncestor;
@@ -163,0 +162,0 @@ }

src/popover.ts

@@ -23,2 +23,11 @@ import { ToggleEvent } from './events.js';
 
+export function isPolyfilled() {
+  // if the `showPopover` method is defined but is not "native code"
+  // then we can infer it's been polyfilled
+  return Boolean(
+    document.body?.showPopover &&
+      !/native code/i.test(document.body.showPopover.toString()),
+  );
+}
+
 function patchSelectorFn<K extends string>(
@@ -38,8 +47,13 @@ object: Record<PropertyKey & K, unknown>,
 const nonEscapedPopoverSelector = /(^|[^\\]):popover-open\b/g;
-const hasLayerSupport = typeof window.CSSLayerBlockRule === 'function';
 
+function hasLayerSupport() {
+  return typeof globalThis.CSSLayerBlockRule === 'function';
+}
+
 // To emulate a UA stylesheet which is the lowest priority in the cascade,
 // all selectors must be wrapped in a :where() which has a specificity of zero.
-const styles = `
-${hasLayerSupport ? '@layer popover-polyfill {' : ''}
+function getStyles() {
+  const useLayer = hasLayerSupport();
+  return `
+${useLayer ? '@layer popover-polyfill {' : ''}
   :where([popover]) {
@@ -100,6 +114,9 @@ position: fixed;
   }
-${hasLayerSupport ? '}' : ''}
+${useLayer ? '}' : ''}
 `;
+}
+
 let popoverStyleSheet: null | false | CSSStyleSheet = null;
 export function injectStyles(root: Document | ShadowRoot) {
+  const styles = getStyles();
   if (popoverStyleSheet === null) {
@@ -127,3 +144,3 @@ try {
 export function apply() {
-  window.ToggleEvent = window.ToggleEvent || ToggleEvent;
+  globalThis.ToggleEvent = globalThis.ToggleEvent || ToggleEvent;
 
@@ -130,0 +147,0 @@ function rewriteSelector(selector: string) {

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