wpt/css/css-cascade/revert-rule-basic.html at ef263ea882747a65452eb3dcd82bfbdc144bcbf2 · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>The revert-rule keyword: basic behavior</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: green;
  }
  #test1 {
    color: red;
    color: revert-rule;
  }
</style>
<div id=test1></div>
<script>
  test(() => {
    assert_true(CSS.supports('color:revert-rule'));
    assert_equals(getComputedStyle(test1).color, 'rgb(0, 128, 0)')
  }, 'The revert-rule keyword rolls back to the previous rule');
</script>


<style>
  #test2 { /* Specificity: (0, 0, 1) */
    color: red;
  }
  #test2#test2#test2 { /* Specificity: (0, 0, 3) */
    color: red;
    color: revert-rule;
  }
  #test2#test2 { /* Specificity: (0, 0, 2) */
    color: green;
  }
</style>
<div id=test2></div>
<script>
  test(() => {
    assert_true(CSS.supports('color:revert-rule'));
    assert_equals(getComputedStyle(test2).color, 'rgb(0, 128, 0)')
  }, 'Cascade order determines the previous rule, not order of appearance');
</script>


<style>
  #test3 {
    color: red;
  }
  #test3 {
    color: green;
  }
</style>
<div id=test3 style="color:red; color:revert-rule"></div>
<script>
  test(() => {
    assert_true(CSS.supports('color:revert-rule'));
    assert_equals(getComputedStyle(test3).color, 'rgb(0, 128, 0)')
  }, 'Reverting from style attribute reverts to regular rules');
</script>


<style>
  #test4 {              z-index: 1; }
  #test4 {              z-index: 2; }
  #test4 { z-index: -1; z-index: revert-rule; }
  #test4 { z-index: -1; z-index: revert-rule; }
  #test4 { z-index: -1; z-index: revert-rule; }
</style>
<div id=test4></div>
<script>
  test(() => {
    assert_true(CSS.supports('z-index:revert-rule'));
    assert_equals(getComputedStyle(test4).zIndex, '2')
  }, 'A chain of revert-rule works');
</script>