wpt/css/css-values/tree-counting/sibling-index-linear-gradient-gcs.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>CSS Values Test: getComputedStyle() for linear-gradient() with sibling-index()</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#tree-counting">
<link rel="help" href="https://drafts.csswg.org/css-values-4/#calc-serialize">
<link rel="help" href="https://drafts.csswg.org/css-images-4/#linear-gradients">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  #t1 {
    background-image: linear-gradient(white, rgb(0 0 calc(sibling-index() * 200)));
  }
  #t2 {
    background-image: cross-fade(linear-gradient(white, rgb(0 0 calc(sibling-index() * 200))) 40%, rgb(0 0 calc(sibling-index() * 200)) 60%);
  }
  #t3 {
    background-image: image-set(linear-gradient(white, rgb(0 0 calc(sibling-index() * 200))) 1x);
  }
</style>
<div>
  <div id="t1"></div>
</div>
<div>
  <div id="t2"></div>
</div>
<div>
  <div id="t3"></div>
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(t1).backgroundImage, "linear-gradient(rgb(255, 255, 255), rgb(0, 0, 200))");
  }, "Check that sibling-index() is resolved in serialization of computed value of linear-gradient()");

  test(() => {
    assert_equals(getComputedStyle(t2).backgroundImage, "cross-fade(linear-gradient(rgb(255, 255, 255), rgb(0, 0, 200)) 40%, rgb(0, 0, 200) 60%)");
  }, "Check that sibling-index() is resolved in serialization of computed value of linear-gradient() inside cross-fade()");

  test(() => {
    assert_equals(getComputedStyle(t3).backgroundImage, "image-set(linear-gradient(rgb(255, 255, 255), rgb(0, 0, 200)) 1dppx)");
  }, "Check that sibling-index() is resolved in serialization of computed value of linear-gradient() inside image-set()");
</script>