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Editorial Team
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Asked: 2026-05-11T16:23:32+00:00

Like many programs flash their window on the taskbar / dock to alert the

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Like many programs flash their window on the taskbar / dock to alert the user to switch to the program,

Is it possible to flash the Browser window using Javascript? (FireFox-only scripts are also welcome)

This is useful for web-based Chat / Forum / Community-based software where there is lots of real-time activity.

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1 Answer

  1. Editorial Team

    @Hexagon Theory: Why would you ever rewrite the whole head element just to change the value of one element in the head? Your solution is horribly inefficient on multiple levels.

    <html>
<head>
<link rel="icon" href="on.png" type="image/png" id="changeMe" />
<script type="text/javascript" src="flash.js"></script>
</head>
<body>
</body>
</html>

    flash.js:

    function Flasher(speed) {
  var elem = document.getElementById('changeMe');

  this.timer = setTimeout(function() {
    elem.href = elem.href ==  'on.png' ? 'off.png' : 'on.png';
  }, speed);

  this.stop = function() { clearTimeout(this.timer); }
}

/* sample usage
 *
 * var flasher = new Flasher(1000);
 * flasher.stop();
 */

    It didn’t really have to be a class but it helped keep the global namespace clean. That’s untested but if simply changing the href doesn’t work for some reason, clone the link node, change the href and replace the old link with the cloned one.

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