cross-fade-computed-value.html

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This test has a WPT meta file that expects 7 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-images/cross-fade-computed-value.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>cross-fade() computed value</title>

    <link rel="author" title="Steinar H. Gunderson" href="mailto:sesse@chromium.org">

    <link rel="help" href="https://drafts.csswg.org/css-images-4/#cross-fade-function">

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

    <script src="/css/support/computed-testcommon.js"></script>

    <style>

      #target {

        color: red;

    </style>

  </head>

  <body>

    <div id="target"></div>

    <script>

      // https://drafts.csswg.org/css-images-4/#serialization specifies that

      // “For cross-fade(), always serialize the <percentage>.”, but it's not clear what

      // “the” percentage is, since the implicit percentages are different for drawing and

      // sizing, and may not be known computed-value time, so we assume one that is not

      // given should also not be serialized.

      test_computed_value(

        'background-image',

        'cross-fade(30% color-mix(in srgb, currentcolor, blue), white)',

        'cross-fade(color(srgb 0.5 0 0.5) 30%, rgb(255, 255, 255))');

      // Unneccessary percentages should be kept.

      test_computed_value('background-image', 'cross-fade(50% red, 50% green)',

        'cross-fade(rgb(255, 0, 0) 50%, rgb(0, 128, 0) 50%)');

      // Percentage normalization should not be visible computed-value time.

      test_computed_value('background-image', 'cross-fade(20% red, 20% green)',

        'cross-fade(rgb(255, 0, 0) 20%, rgb(0, 128, 0) 20%)');

      // More than two values.

      test_computed_value('background-image',

        'cross-fade(50% red, 50% green, 50% blue)',

        'cross-fade(rgb(255, 0, 0) 50%, rgb(0, 128, 0) 50%, rgb(0, 0, 255) 50%)');

      // More-than-100% should be invalid, but in calc() we can't reject it parse-time;

      // it will be clamped on serialization.

      test_computed_value('background-image',

        'cross-fade(calc(101%) red, green)',

        'cross-fade(rgb(255, 0, 0) 100%, rgb(0, 128, 0))');

      test_computed_value('background-image',

        'cross-fade(calc(-200%) red, green)',

        'cross-fade(rgb(255, 0, 0) 0%, rgb(0, 128, 0))');

      // The percentage here is not resolvable parse-time, but should always be 49%

      // for all reasonable font sizes.

      test_computed_value('background-image',

        'cross-fade(calc(50% + 1% * sign(1em - 10000px)) red, green)',

        'cross-fade(rgb(255, 0, 0) 49%, rgb(0, 128, 0))');

    </script>

  </body>

</html>