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Maven Central Adds Sigstore Signature Validation
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github.com/googlechrome/dialog-polyfill
dialog-polyfill.js is a polyfill for <dialog>
and <form method="dialog">
.
Check out some demos!
<dialog>
is an element for a popup box in a web page, including a modal option which will make the rest of the page inert during use.
This could be useful to block a user's interaction until they give you a response, or to confirm an action.
See the HTML spec.
You may optionally install via NPM -
$ npm install dialog-polyfill
There are several ways that to include the dialog polyfill:
dist/dialog-polyfill.js
script directly in your HTML, which exposes a global dialogPolyfill
function.import
(es modules)require
(commonjs/node)// direct import (script module, deno)
import dialogPolyfill from './node_modules/dialog-polyfill/dist/dialog-polyfill.esm.js';
// *OR*
// modern es modules with rollup/webpack bundlers, and node via esm module
import dialogPolyfill from 'dialog-polyfill'
// *OR*
// traditional commonjs/node and browserify bundler
const dialogPolyfill = require('dialog-polyfill')
This polyfill works on modern versions of all major browsers. It also supports IE9 and above. It can work when used inside Shadow DOM, but it's not recommended.
<head>
of your document, and the JS anywhere before referencing dialogPolyfill
.dialogPolyfill.registerDialog()
, passing it one node at a time. This polyfill won't replace native support.<dialog>
elements!<head>
<link rel="stylesheet" type="text/css" href="dist/dialog-polyfill.css" />
</head>
<body>
<dialog>
I'm a dialog!
<form method="dialog">
<input type="submit" value="Close" />
</form>
</dialog>
<script src="dist/dialog-polyfill.js"></script>
<script>
var dialog = document.querySelector('dialog');
dialogPolyfill.registerDialog(dialog);
// Now dialog always acts like a native <dialog>.
dialog.showModal();
</script>
</body>
In native <dialog>
, the backdrop is a pseudo-element.
When using the polyfill, the backdrop will be an adjacent element:
dialog::backdrop { /* native */
background-color: green;
}
dialog + .backdrop { /* polyfill */
background-color: green;
}
In the polyfill, modal dialogs have limitations-
The major limitation of the polyfill is that dialogs should not have parents that create a stacking context.
The easiest way to solve this is to move your <dialog>
element to be a child of <body>
.
If this isn't possible you may still be able to use the dialog. However, you may want to resolve it for two major reasons-
To position a dialog in the center (regardless of user scroll position or stacking context), you can specify the following CSS-
dialog {
position: fixed;
top: 50%;
transform: translate(0, -50%);
}
This is also provided as a helper CSS class in the polyfill CSS, .fixed
.
You can apply by using HTML like <dialog class="fixed">
.
The WAI-ARIA doc suggests returning focus to the previously focused element after a modal dialog is closed.
However, this is not part of the dialog spec itself.
See this snippet to add this, even to the native dialog
.
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