wpt/css/css-cascade/revert-rule-important.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>The revert-rule keyword: interaction with !important</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-rule-keyword">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #test1 {
    color: revert-rule !important;
  }
  #test1 {
    color: green;
  }
</style>
<div id="test1"></div>
<script>
  test(() => {
    assert_true(CSS.supports('color:revert-rule'));
    assert_equals(getComputedStyle(test1).color, 'rgb(0, 128, 0)');
  }, 'revert-rule in !important declaration reverts to later normal rule if the !important rule comes first');
</script>

<style>
  @layer {
    #test2 {
      color: revert-rule !important;
    }
  }
  #test2 {
    color: green;
  }
</style>
<div id='test2'></div>
<script>
  test(() => {
    assert_equals(getComputedStyle(test2).color, 'rgb(0, 128, 0)');
  }, 'revert-rule in !important declaration reverts across layers');
</script>

<style>
  #test3 {
    color: green;
  }
  #test3 {
    color: revert-rule !important;
  }
</style>
<div id='test3'></div>
<script>
  test(() => {
    assert_equals(getComputedStyle(test3).color, 'rgb(0, 128, 0)');
  }, 'revert-rule in !important declaration reverts to earlier normal rule if the !important rule comes later');
</script>