author Stanca Serban <>
Fri, 25 Nov 2022 18:35:18 +0200
changeset 643645 8b092cca2cab001ed8d13fc83d17bdba39cffe0d
parent 469640 c9c0c6f2eed54a187e124942e53c3660b4cf17d8
permissions -rw-r--r--
Backed out changeset dab070a6ba77 (bug 1802125) for causing wpt failures on /clipboard-apis. CLOSED TREE

  <meta charset="utf-8">
  <title>Test for overflow events</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  <script type="application/javascript">


  window.addEventListener("load", function(event) {
      if ( == document) {

  /** Test for Bug 981637:  correct overflow event firing in updateOverflow **/

  var overflow_fired = false;
  function overflow_listener(event) {
    overflow_fired = true;

  function test_bug981637() {
    var outerDiv = document.getElementById("bug981637");
    var innerDiv = outerDiv.firstChild;
    innerDiv.offsetWidth; // flush layout
    is(overflow_fired, false, "correct setup");
    outerDiv.addEventListener("overflow", overflow_listener); = "scale(1.2)";
    innerDiv.offsetWidth; // flush layout
    // run finish step after the overflow event fires (off the event loop)
    setTimeout(test_bug981637_step2, 0);

  function test_bug981637_step2() {
    is(overflow_fired, true, "overflow event should have fired after updating transform");

<a target="_blank" href="">Mozilla Bug 981637</a>
<div id="bug981637" style="overflow: hidden; width: 100px; height: 100px;"><div style="transform: scale(0.8); width: 100px; height: 100px"></div></div>
<pre id="test">