wpt/css/css-mixins/contents-rule.html at 6e9998aa16934d94b749273a0ee8313124eeaeef · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Mixins: The @contents rule</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() {
        @result {
          @contents;
        }
      }
      #e1 {
        color: red;
        @apply --m1 { color: green; }
      }
    </style>
    <div id="e1">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e1');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Simple @contents with no fallback');
    </script>


    <style>
      @mixin --m2() {
        @result {
          @contents
        }
      }
      #e2 {
        color: red;
        @apply --m2 { color: green; }
      }
    </style>
    <div id="e2">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e2');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Implicit semicolon after @contents, at end of block');
    </script>


    <style>
      @mixin --m3() {
        @result {
          &.a {
            @contents { color: blue; }
          }
        }
      }
      .b {
        color: red;
        @apply --m3 { color: green; }
      }
    </style>
    <div class="a b" id="e3">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e3');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Block in @apply overrides fallback');
    </script>


    <style>
      @mixin --m4() {
        @result {
          &.c {
            @contents { color: green; }
          }
        }
      }
      .d {
        color: red;
        @apply --m4;
      }
    </style>
    <div class="c d" id="e4">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e4');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Fallback is used if @apply has no block');
    </script>


    <style>
      @mixin --m6() {
        @result {
          @contents { }
          color: green;
        }
      }
      #e6 {
        @apply --m6;
      }
    </style>
    <div id="e6">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e6');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Empty @contents block is allowed, but does nothing');
    </script>


    <style>
        @mixin --m7() {
          @result {
            @contents;
            color: green;
          }
        }
        #e7 {
          @apply --m7 {};
        }
    </style>
    <div id="e7">This text should be green.</div>
    <script>
      test(() => {
        let target = document.getElementById('e7');
        assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
      }, 'Empty @contents parameter does not crash');
    </script>
  </body>
</html>