starting-style-parsing.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/parsing/starting-style-parsing.html - WPT Dashboard Interop Dashboard

<!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>