parse-is-where.html

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This WPT test may be referenced by the following Test IDs:
- /css/selectors/parsing/parse-is-where.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>CSS Selectors: :is() and :where() parsing</title>

<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">

<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">

<link rel="help" href="https://drafts.csswg.org/selectors-4/#zero-matches">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/css/support/parsing-testcommon.js"></script>

<script>

  function assert_valid(valid, pattern, expected_pattern, description) {

    for (let pseudo of ["is", "where"]) {

      let selector = pattern.replace("{}", ":" + pseudo);

      let expected_selector = selector;

      if (expected_pattern != null)

        expected_selector = expected_pattern.replace("{}", ":" + pseudo);

      if (valid) {

        test_valid_selector(selector, expected_selector);

      } else {

        test_valid_forgiving_selector(selector);

  assert_valid(true, "{}(div )", "{}(div)", "Trailing whitespace");

  assert_valid(true, "{}(div + bar, div ~ .baz)", null, "Multiple selectors with combinators");

  assert_valid(true, "{}(:is(div))", null, "Nested :is");

  assert_valid(true, "{}(:where(div))", null, "Nested :where");

  assert_valid(true, ":host({}(div))", null, "Nested inside :host, without combinators");

  assert_valid(true, ":host({}(div ))", ":host({}(div))", "Nested inside :host, with trailing whitespace");

  // See https://github.com/w3c/csswg-drafts/issues/5093

  assert_valid(false, ":host({}(div .foo))", null, "Nested inside :host, with combinators");

  assert_valid(true, "{}(:hover, :active)", null, "Pseudo-classes inside");

  assert_valid(true, "{}(div):hover", null, "Pseudo-classes after");

  assert_valid(true, "{}(div)::before", null, "Pseudo-elements after");

  assert_valid(false, "{}(::before)", null, "Pseudo-elements inside");

  assert_valid(true, "{}(div) + bar", null, "Combinators after");

  assert_valid(true, "::part(foo){}(:hover)", null, "After part with simple pseudo-class");

  assert_valid(false, "::part(foo){}([attr='value'])", null, "After part with invalid selector after");

  assert_valid(true, ":not({}(div))", null, "Nested inside :not, without combinators");

  assert_valid(true, ":not({}(div .foo))", null, "Nested inside :not, with combinators");

  // This should be invalid even with the forgiving behavior because

  // `<any-value>` doesn't allow bad tokens:

  // https://drafts.csswg.org/css-syntax-3/#typedef-declaration-value

  test_invalid_selector(`:is(# C4єанйтж╕/┘ГЁжЮХєа▓┐ЁЭБМєаСеЁЭЖА%=[ямм0)`);

</script>