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chromium/third_party/blink/web_tests/external/wpt/css/css-anchor-position/parsing/anchor-scope-parsing.html 

<!DOCTYPE html>
<title>CSS Anchor Positioning Test: Parsing of anchor-scope</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-scope">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<div id="target"></div>
<script>
  test_valid_value("anchor-scope", "initial");
  test_valid_value("anchor-scope", "inherit");
  test_valid_value("anchor-scope", "unset");
  test_valid_value("anchor-scope", "revert");
  test_valid_value("anchor-scope", "none");
  test_valid_value("anchor-scope", "all");
  test_valid_value("anchor-scope", "--a");
  test_valid_value("anchor-scope", "--a, --b");
  test_valid_value("anchor-scope", "--a, --b, --c");

  test_invalid_value("anchor-scope", "--a none");
  test_invalid_value("anchor-scope", "none --a");
  test_invalid_value("anchor-scope", "none all");
  test_invalid_value("anchor-scope", "--a --b");
  test_invalid_value("anchor-scope", "a, b, c");
  test_invalid_value("anchor-scope", "");
</script>