custom-property-transition-inherited-used-by-standard-property.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-properties-values-api/animation/custom-property-transition-inherited-used-by-standard-property.html - WPT Dashboard Interop Dashboard

<!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>

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

<div id="container">

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

</div>

<script>

test(() => {

  const customProperty = "--my-length";

  CSS.registerProperty({

    name: customProperty,

    syntax: "<length>",

    inherits: true,

    initialValue: "100px"

});

  target.style.marginLeft = `var(${customProperty})`;

  assert_equals(getComputedStyle(target).marginLeft, "100px");

  assert_equals(getComputedStyle(target).getPropertyValue(customProperty), "100px");

  container.style.transition = `${customProperty} 1s -500ms linear`;

  container.style.setProperty(customProperty, "200px");

  assert_equals(getComputedStyle(target).marginLeft, "150px");

}, "Running a transition an inherited CSS variable is reflected on a standard property using that variable as a value");

</script>