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chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/parsing/starting-style-parsing.html 

<!doctype html>
<title>@starting-style: parsing</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#at-ruledef-starting-style">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<main id=main></main>
<script>
  function test_valid(actual, expected) {
    if (expected === undefined)
      expected = actual;
    test(t => {
      t.add_cleanup(() => main.replaceChildren());
      let style = document.createElement('style');
      style.textContent = `${actual}{}`;
      main.append(style);
      assert_equals(style.sheet.rules.length, 1);
      let rule = style.sheet.rules[0];
      assert_equals(rule.cssText, `${expected} {\n}`);
    }, `${actual} is valid`);
  }

  function test_invalid(actual) {
    test(t => {
      t.add_cleanup(() => main.replaceChildren());
      let style = document.createElement('style');
      style.textContent = `${actual}{}`;
      main.append(style);
      assert_equals(style.sheet.rules.length, 0);
    }, `${actual} is not valid`);
  }

  test_valid('@starting-style');

  test_invalid('@starting-style div');
  test_invalid('@starting-style ()');
  test_invalid('@starting-style ( {}');
  test_invalid('@starting-style }');
</script>