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dialog-polyfill.js is a polyfill for <dialog>.

<dialog> is an element for a popup box in a web page. See more information and demos and the HTML spec.

Example

<head>
  <script src="dialog-polyfill.js"></script>
  <link rel="stylesheet" type="text/css" href="dialog-polyfill.css">
</head>
<body>
  <dialog>I'm a dialog!</dialog>
  <script>
    var dialog = document.querySelector('dialog');
    dialogPolyfill.registerDialog(dialog);
    // Now dialog acts like a native <dialog>.
    dialog.showModal();
  </script>
</body>

::backdrop

In native <dialog>, the backdrop is a pseudo-element:

#mydialog::backdrop {
  background-color: green;
}

With the polyfill, you do it like:

#mydialog + .backdrop {
  background-color: green;
}

Known limitations

  • Modality isn't bulletproof. For example, you can tab to inert elements.
  • The polyfill <dialog> should always be a child of <body>.
  • Polyfill top layer stacking can be ruined by playing with z-index.
  • The polyfill <dialog> does not retain dynamically set CSS top/bottom values upon close.
  • Anchored positioning is not implemented. The native <dialog> in Chrome doesn't have it either.