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@samthor
samthor / dialog-focus-restore.js
Last active December 1, 2023 14:39
Restore focus after a HTML dialog is shown modally
/**
* Updates the passed dialog to retain focus and restore it when the dialog is closed. Won't
* upgrade a dialog more than once. Supports IE11+ and is a no-op otherwise.
* @param {!HTMLDialogElement} dialog to upgrade
*/
var registerFocusRestoreDialog = (function() {
if (!window.WeakMap || !window.MutationObserver) {
return function() {};
}
var registered = new WeakMap();

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.


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