wpt/css/css-mixins/mixin-shadow-dom.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Mixins: Shadow DOM</title>
    <link rel="help" href="https://drafts.csswg.org/css-mixins-1/#defining-mixins">
    <link rel="help" href="https://drafts.csswg.org/css-shadow-1/#css-tree-scoped-name">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>

    <style>
      @mixin --exists-only-outside-shadow() {
        @result {
          color: green;
        }
      }
    </style>
    <div id="host1">
      <template shadowrootmode="open">
        <style>
          #e1 {
            color: red;
            @apply --exists-only-outside-shadow;
          }
        </style>
        <div id="e1">This text should be green.</div>
      </template>
    </div>
    <script>
      test(() => {
        let target = document.getElementById('host1').shadowRoot.getElementById('e1');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Style in shadow DOM should have access to outside non-adopted mixins');
    </script>


    <div id="host2">
      <template shadowrootmode="open">
        <style>
          #e2 {
            color: red;
            @apply --m1;
          }
        </style>
        <style>
          @mixin --m1() {
            @result {
              color: green;
            }
          }
        </style>
        <div id="e2">This text should be green.</div>
      </template>
    </div>
    <script>
      test(() => {
        let target = document.getElementById('host2').shadowRoot.getElementById('e2');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Style in shadow DOM should have access to inside mixins');
    </script>


    <style>
    </style>
    <div id="host3">
      <template shadowrootmode="open">
        <style>
          #e3 {
            color: red;
            @apply --exists-only-in-adopted;
          }
        </style>
        <div id="e3">This text should be green.</div>
      </template>
    </div>
    <script>
      test(() => {
        const sheet = new CSSStyleSheet();
        sheet.replaceSync('@mixin --exists-only-in-adopted() { @result { color: green; } }');
        document.getElementById('host3').shadowRoot.adoptedStyleSheets = [sheet];

        let target = document.getElementById('host3').shadowRoot.getElementById('e3');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Style in shadow DOM should have access to mixins from adopted stylesheets');
    </script>


    <div id="host4">
      <template shadowrootmode="open">
        <style>
          @mixin --in-shadow() {
            @result {
              color: red;
            }
          }
        </style>
      </template>
    </div>
    <style>
      #e4 {
        color: green;
        @apply --in-shadow;
      }
    </style>
    <div id="e4">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e4');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Style outside shadow DOM should _not_ have access to inside mixins');
    </script>

  </body>
</html>