wpt/css/selectors/invalidation/sheet-going-away-001.html at master · web-platform-tests/wpt · GitHub

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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: invalidation of class changes when the sheet the style depends on goes away</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" href="https://un5n798jx6qx6j0rmf2verhh.julianrbryant.com/selectors-4/#invalid">
<link rel="help" href="https://un5h208565ak8emkwgjjkgb49yug.julianrbryant.com/show_bug.cgi?id=1432850">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  body { background: green; }
</style>
<style id="style">
  .red { background: red; }
</style>
<body class="red">
Should have a green background.
<script>
test(() => {
  document.body.offsetTop;
  assert_equals(getComputedStyle(document.body).backgroundColor, "rgb(255, 0, 0)");
  document.body.className = "";
  style.remove();
  assert_equals(getComputedStyle(document.body).backgroundColor, "rgb(0, 128, 0)");
}, "Style should be recomputed correctly when the stylesheet it depends on goes away");
</script>
</body>