File: cssstyledeclaration-mutationrecord-003.html

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<!doctype html>
<meta charset="utf-8">
<title>CSSOM: CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed, invoked from setPropertyValue</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setpropertyvalue">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
  let test = async_test("CSSStyleDeclaration.removeProperty doesn't queue a mutation record when not actually removed, invoked from setPropertyValue");
  document.documentElement.style.top = "0";
  let m = new MutationObserver(test.unreached_func("shouldn't queue a mutation record"));
  m.observe(document.documentElement,  { attributes: true });

  document.documentElement.style.width = "";
  requestAnimationFrame(() => test.done());
</script>