File: contents-nested-declarations.html

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Mixins: @contents rules become nested declarations</title>
    <link rel="help" href="https://drafts.csswg.org/css-mixins-1/#contents-rule">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>

  <style>
    @mixin --m1() {
      @contents;
    }
    #e1::after {
      content: "AFTER";
      @apply --m1 {
        color: green;
      }
    }
  </style>
  <div id="e1"></div>
  <script>
    test(() => {
      assert_equals(getComputedStyle(e1, '::after').color, 'rgb(0, 128, 0)');
    }, 'Can mix declarations into pseudo-elements via @contents');
  </script>


  <style>
    @mixin --m2() {
      @contents;
    }
    /* Should match <div id=e2> with the specificity of :where(#e2) (zero),
       not with the specificity of :is(:where(#e2), #u1). */
    :where(#e2), #u1 {
      @apply --m2 {
        color: red;
      }
    }
    :where(#e2) {
      color: green; /* Wins. */
    }
  </style>
  <div id="e2"></div>
  <script>
    test(() => {
      assert_equals(getComputedStyle(e2).color, 'rgb(0, 128, 0)');
    }, 'Nested declarations from @contents have top-level specificity behavior');
  </script>

  </body>
</html>