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chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/navigation/with-types/at-rule-with-types-parsing.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>View transitions: parsing @view-transition rule with types</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  function parse_types(declaration) {
    const stylesheet = new CSSStyleSheet();
    stylesheet.replaceSync(`@view-transition { types: ${declaration} }`);
    return stylesheet.rules.length ? stylesheet.rules[0].types : null;
  }

  function types_parser_test(declaration, expected) {
    test(() => {
      const result = parse_types(declaration);
      assert_array_equals(result, expected);
    }, `types: ${declaration} shoud result in ${JSON.stringify(expected)}`);
  }

  types_parser_test("none", []);
  types_parser_test("abc", ["abc"]);
  types_parser_test("abc xyz", ["abc", "xyz"]);
  types_parser_test("   abc \txyz ", ["abc", "xyz"]);
  types_parser_test("abc none", []);
  types_parser_test("abc -ua-something", []);
  types_parser_test("abc -ok-something", ["abc", "-ok-something"]);
  types_parser_test("abc abc", ["abc", "abc"]);
  types_parser_test("abc ABC", ["abc", "ABC"]);
  types_parser_test("123", []);
  types_parser_test("*", []);
  types_parser_test("*11 abc", []);
</script>
<script>