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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/anchor-name-basics.html 

<!DOCTYPE html>
<title>Tests basics of the 'anchor-name' property</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#propdef-anchor-name">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<script src="/css/support/inheritance-testcommon.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<div id="container">
  <div id="target"></div>
</div>

<script>
// anchor-name: none | <dashed-ident>#
test_valid_value('anchor-name', 'none');
test_valid_value('anchor-name', '--foo');
test_valid_value('anchor-name', '--foo, --bar')
test_invalid_value('anchor-name', 'foo-bar');
test_invalid_value('anchor-name', '--foo --bar')
test_invalid_value('anchor-name', '100px');
test_invalid_value('anchor-name', '100%');

// Computed value: as specified
test_computed_value('anchor-name', 'none');
test_computed_value('anchor-name', '--foo');
test_computed_value('anchor-name', '--foo, --bar');

// Initial: none
// Inherited: no
assert_not_inherited('anchor-name', 'none', '--foo');

// Animation type: discrete
test_no_interpolation({
  property: 'anchor-name',
  from: '--foo',
  to: 'none',
});
</script>