tor-browser

The Tor Browser
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cssstyledeclaration-mutationrecord-004.html (874B)

      1 <!doctype html>
      2 <meta charset="utf-8">
      3 <title>CSSOM: CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed</title>
      4 <link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
      5 <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
      6 <script src=/resources/testharness.js></script>
      7 <script src=/resources/testharnessreport.js></script>
      8 <script>
      9  let test = async_test("CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed");
     10  document.documentElement.style.top = "0";
     11  let m = new MutationObserver(test.unreached_func("shouldn't queue a mutation record"));
     12  m.observe(document.documentElement,  { attributes: true });
     13 
     14  document.documentElement.style.removeProperty("width");
     15  requestAnimationFrame(() => test.done());
     16 </script>