wpt/css/css-mixins/mixin-parameters.html at cac62c5c97fb235950ad5aaa07089060e29f07ca · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>CSS Mixins: Parameters</title>
    <link rel="help" href="https://drafts.csswg.org/css-mixins/#mixin-args">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <body>

  <style>
    @mixin --m1() {
      @result {
        color: green;
      }
    }
    @mixin --m1(junk-in-parameter-list) {  /* Will be ignored. */
      @result {
        color: red;
      }
    }
    #e1 {
      @apply --m1;
    }
  </style>
  <div><div id="e1">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e1');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Mixins with invalid parameter lists are ignored');
  </script>


  <style>
    @mixin --m2(--my-color) {
      @result {
        color: var(--my-color);
      }
    }
    #e2 {
      @apply --m2(green);
    }
  </style>
  <div><div id="e2">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e2');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Basic mixin parameter passing');
  </script>


  <style>
    @mixin --m2b(--my-color) {
      @result {
        color: var(--my-color);
      }
    }
    #e2b {
      @apply --m2b(navy);
    }
  </style>
  <div><div id="e2b">This text should be navy.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e2b');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 128)');
    }, 'Mixins can be called multiple times with different parameters');
  </script>


  <style>
    @mixin --m2c(--my-color) {
      @result {
        color: var(--my-color);
      }
    }
    #e2c {
      color: fuchsia;
      @apply --m2c();
    }
  </style>
  <div><div id="e2c">This text should be fuchsia.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e2c');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 0)');
    }, 'Too few parameters and no default ignores mixin');
  </script>


  <style>
    @mixin --m3(--my-color) {
      @result {
        color: var(--my-color);
      }
    }
    #e3 {
      @apply --m3({green});
    }
  </style>
  <div><div id="e3">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e3');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Mixin argument parsing with arguments wrapped in {}');
  </script>


  <style>
    @mixin --m4(--my-color: green) {
      @result {
        color: var(--my-color);
      }
    }
    #e4 {
      @apply --m4;
    }
  </style>
  <div><div id="e4">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e4');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Defaults in mixin parameters');
  </script>


  <style>
    @mixin --m5() {
      @result {
        color: red;
      }
    }
    #e5 {
      color: green;
      @apply --m5(too-many-parameters);
    }
  </style>
  <div><div id="e5">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e5');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, '@apply with too many parameters is ignored');
  </script>


  <style>
    @mixin --m6(--my-color) {
      @result {
        color: var(--my-color, navy);
      }
    }
    #e6 {
      @apply --m6(green);
    }
  </style>
  <div><div id="e6">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e6');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Fallback is ignored if argument is given');
  </script>


  <style>
    @mixin --m6b(--my-color) {
      @result {
        color: var(--my-color, navy);
      }
    }
    #e6b {
      @apply --m6b;
    }
  </style>
  <div><div id="e6b">This text should be navy.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e6b');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 128)');
    }, 'Fallback is used with no parameter and no default');
  </script>


  <style>
    @mixin --m6c(--my-color) {
      @result {
        color: var(--my-color, navy);
      }
    }
    #e6c {
      @apply --m6c(invalid-color);
    }
  </style>
  <div><div id="e6c">This text should be black.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e6c');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 0)');
    }, 'Fallback is not used on other errors');
  </script>


  <style>
    #e6d {
      color: var(--not-within-mixin, green);
    }
  </style>
  <div><div id="e6d">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e6d');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Fallback is not when outside mixin');
  </script>


  <style>
    #e6e {
      color: var(--not-within-mixin);
    }
  </style>
  <div><div id="e6e">This text should be black.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e6e');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 0)');
    }, 'Invalid when no fallback and outside mixin');
  </script>


  <style>
    @mixin --m7(--my-color) {
      @result {
        color: attr(color-attr type(<color>));
      }
    }
    #e7 {
      @apply --m7(green);
    }
  </style>
  <div><div id="e7" color-attr="var(--my-color)">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e7');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'var() can be accessed from attributes');
  </script>


  <style>
    @mixin --m8(--my-length type(<length>)) {
      @result {
        font-size: 10px;
        --some-length: var(--my-length);
      }
    }
    #e8 {
      @apply --m8(1.0em);
    }
  </style>
  <div><div id="e8">This text does not matter.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e8');
      assert_equals(getComputedStyle(target).getPropertyValue('--some-length'), '10px');
    }, 'var() resolves typed parameters');
  </script>


  <style>
    @mixin --m9(--my-length type(length)) {  /* Note the syntax error. */
      @result {
        font-size: 10px;
        --some-length: var(--my-length);
      }
    }
    #e9 {
      @apply --m9(1.0em);
    }
  </style>
  <div><div id="e9">This text does not matter.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e9');
      assert_equals(getComputedStyle(target).getPropertyValue('--some-length'), '');
      assert_equals(getComputedStyle(target).fontSize, '10px');
    }, 'var() refuses illegal syntax parameters, but does not fail entire mixin');
  </script>


  <style>
    @mixin --m10inner(--inner-color) {
      @result {
        color: var(--outer-color);
      }
    }
    @mixin --m10outer(--outer-color) {
      @result {
        @apply --m10inner(red);
      }
    }
    #e10 {
      @apply --m10outer(green);
    }
  </style>
  <div><div id="e10">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e10');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'var() can access parameters from outer mixins');
  </script>


  <style>
    @mixin --m11(--val, --true, --false) {
      @result {
        color: if(style(--x: var(--val)): var(--true); else: var(--false))
      }
    }
    #e11 {
      --x: a;
      @apply --m11(a, green, red);
    }
  </style>
  <div><div id="e11">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e11');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'var() works inside if, in condition and true branch');
  </script>


  <style>
    @mixin --m11b(--val, --true, --false) {
      @result {
        color: if(style(--x: var(--val)): var(--true); else: var(--false))
      }
    }
    #e11b {
      --x: a;
      @apply --m11b(b, red, green);
    }
  </style>
  <div><div id="e11b">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e11b');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'var() works inside if, in condition and false branch');
  </script>


  <style>
    @function --f() {
      color: var(--my-color);
    }
    @mixin --m12(--my-color) {
      @result {
        color: --f();
      }
    }
    #e12 {
      @apply --m12(red);
    }
  </style>
  <div><div id="e12">This text should be black.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e12');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 0, 0)');
    }, 'var() within a function should not see parameters from a calling mixin');
  </script>

  <style>
  @mixin --m13-override-outer(--inner, --outer) {
    @result {
      color: var(--inner);
    }
  }
  @mixin --m13-set-inner(--inner) {
    @result {
      @apply --m13-override-outer(var(--inner), red);
    }
  }
  @mixin --m13(--outer) {
    @result {
      @apply --m13-set-inner(var(--outer));
    }
  }
  #e13 {
    @apply --m13(green);
  }
  </style>
  <div><div id="e13">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e13');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Mixin arguments are resolved at call site, not at use');
  </script>

  <style>
    @mixin --m14(--param: green) {
      @result {
        color: var(--param);
      }
    }
    #e14 {
      @apply --m14();
    }
  </style>
  <div><div id="e14">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e14');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'var() supports default parameters');
  </script>

  <style>
    @mixin --m15(--my-length type(<length>): 1em) {
      @result {
        --some-length: var(--my-length);
      }
    }
    #e15 {
      font-size: 12px;
      @apply --m15();
    }
  </style>
  <div><div id="e15">This text does not matter.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e15');
      assert_equals(getComputedStyle(target).getPropertyValue('--some-length'), '12px');
    }, 'var() typed default parameters are resolved against the element');
  </script>

  <style>
    @mixin --m16(--arg: !!) {  /* Invalid declaration. */
      @result {
        color: red;
      }
    }
    #e16 {
      color: green;
      @apply --m16();
    }
  </style>
  <div><div id="e16">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e16');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Invalid defaults should skip declaration, even on unused arguments');
  </script>

  <style>
    @mixin --m17(--arg) {
      @result {
        color: red;
      }
    }
    #e17 {
      color: green;
      @apply --m17(!!!);  /* Invalid invocation. */
    }
  </style>
  <div><div id="e17">This text should be green.</div></div>
  <script>
    test(() => {
      let target = document.getElementById('e17');
      assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
    }, 'Invalid @apply arguments should skip declaration');
  </script>
  </body>
</html>