wpt/css/css-mixins/mixin-parsing.html at fcb8d91e56a2e6f29f9d03ef06c3cd4eba1a64f4 · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Mixins: Parsing</title>
    <link rel="help" href="https://drafts.csswg.org/css-mixins-1/#defining-mixins">
    <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/12417">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>

  <script>
    function test_child(css, is_valid, description) {
      test(() => {
        let sheet = new CSSStyleSheet();
        sheet.replaceSync(css);
        assert_equals(sheet.cssRules.length, 1, 'mixin is present'); // @mixin
        assert_equals(sheet.cssRules[0].cssRules.length, (is_valid ? 1 : 0), 'child count');
      }, `${description} is ${is_valid ? 'valid' : 'invalid'} in @mixin`);
    }
    function test_valid_child(css, description) {
      return test_child(css, /*is_valid=*/true, description);
    }
    function test_invalid_child(css, description) {
      return test_child(css, /*is_valid=*/false, description);
    }

    test_invalid_child('@mixin --m() { @layer bar; }', '@layer (statement)');
    test_invalid_child('@mixin --m() { @layer bar {} }', '@layer (block)');
    test_invalid_child('@mixin --m() { @layer {} }', '@layer (anonymous)');
    test_valid_child('@mixin --m() { div {} }', 'style rule');
    test_valid_child('@mixin --m() { > div {} }', 'style rule (relative)');
    test_valid_child('@mixin --m() { @media (width) {} }', '@media');
    test_valid_child('@mixin --m() { @supports (width:0) {} }', '@supports');
    test_valid_child('@mixin --m() { @container (width) {} }', '@container');
    test_valid_child('@mixin --m() { @starting-style {} }', '@starting-style');
    test_valid_child('@mixin --m() { @scope (.foo) {} }', '@scope');
    test_valid_child('@mixin --m() { @scope {} }', '@scope (implicit)');
  </script>

  </body>
</html>