css/css-mixins/dashed-function-standard-property.html

<!DOCTYPE html>
<title>Custom Functions: Evaluating a &lt;dashed-function> in standard properties</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1/#substitute-a-dashed-function">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
  @function --ten-px() {
    result: 10px;
  }

  @function --ten-px-typed() returns <length> {
    result: 10px;
  }

  @function --green() {
    result: green;
  }

  #target {
    width: --ten-px();
    height: --ten-px-typed();
    color: --green();
    padding: --ten-px();
  }
</style>

<div id=target></div>

<script>
  test(() => {
    assert_equals(getComputedStyle(target).width, '10px');
  }, '<dashed-function> in longhand');

  test(() => {
    assert_equals(getComputedStyle(target).height, '10px');
  }, '<dashed-function> with typed result in longhand');

  test(() => {
    assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
  }, '<dashed-function> with in inherited longhand');

  test(() => {
    assert_equals(getComputedStyle(target).padding, '10px');
  }, '<dashed-function> with typed result in shorthand');
</script>