File: custom-property-animation-used-in-shorthand.html

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<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>

@property --angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

@keyframes angle-animation {
  from { --angle: 0deg }
  to { --angle: 180deg }
}

#target {
  animation: angle-animation 1000s linear -500s paused;
  background: linear-gradient(var(--angle), black, white);
}

</style>

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

<script>

test(() => {
    assert_equals(getComputedStyle(target).backgroundImage, 'linear-gradient(90deg, rgb(0, 0, 0), rgb(255, 255, 255))')
}, "Animated custom property is applied in a shorthand property.");

</script>