tor-browser

The Tor Browser
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animation-pseudo-dynamic-001.html (1141B)

      1 <!doctype html>
      2 <meta charset=utf-8>
      3 <title>Animation of pseudo-element is stopped properly in presence of dynamic DOM change that reconstructs the layout tree</title>
      4 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
      5 <link rel="author" title="Mozilla" href="https://mozilla.org">
      6 <link rel="help" href="https://drafts.csswg.org/css-animations/">
      7 <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1564366">
      8 <link rel="match" href="animation-pseudo-dynamic-001-ref.html">
      9 <style>
     10 @keyframes anim {
     11  from { background-color: red }
     12  to { background-color: red }
     13 }
     14 .test {
     15  display: flex;
     16 }
     17 .test::before {
     18  content: "";
     19  display: block;
     20  width: 100px;
     21  height: 100px;
     22  background-color: green;
     23 }
     24 .tweak::before {
     25  animation: anim 2s linear infinite;
     26 }
     27 </style>
     28 <div class="test tweak">foo</div>
     29 <script>
     30 onload = function() {
     31  const div = document.querySelector(".test");
     32  const pseudoStyle = getComputedStyle(div, "::before");
     33  div.getBoundingClientRect(); // update layout
     34  div.classList.remove("tweak");
     35  div.innerHTML = ""; // This is necessary to trigger the bug.
     36 }
     37 </script>