File: media-queries.html

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<!DOCTYPE html>
  <head>
    <title>CSS Mixins: Media Queries and invalidation</title>
    <link rel="help" href="https://drafts.csswg.org/css-mixins/#mixin-rule">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>
    <iframe id="iframe" width="500" height="300" srcdoc="
      <style>
        @mixin --m1() {
          color: tomato;
        }
        @media (width >= 50px) {
          @mixin --m1() {
            color: cornsilk;
          }
        }
        @media (width < 50px) {
          @mixin --m1() {
            color: mediumvioletred;
          }
        }
      </style>
      <style>
        /* Invalidated by a mixin in a different style sheet. */
        #target {
          @apply --m1;
        }
      </style>
      <div id='target'>Text should be a different color when narrowed.</div>
    "></iframe>
    <script>
      promise_test(async () => {
        await new Promise(r => iframe.addEventListener('load', r));

        let target = iframe.contentDocument.getElementById('target');
        assert_equals(getComputedStyle(target).color, "rgb(255, 248, 220)");  // cornsilk
        iframe.width = 30;
        assert_equals(getComputedStyle(target).color, "rgb(199, 21, 133)");  // mediumvioletred
      });
    </script>
</body>
</html>