css/cssom/style-global-variable.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Setting CSS global variables</title>
<link rel="help" href="https://drafts.csswg.org/cssom/#cssstyledeclaration">
<link rel="help" href="https://drafts.csswg.org/cssom/#the-elementcssinlinestyle-mixin">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!-- regression test for https://github.com/jsdom/jsdom/issues/3833 -->

<body>
<script>
"use strict";

test(() => {
  const { body } = document;
  body.style.setProperty("top", "0px");
  assert_equals(body.style.getPropertyValue("top"), "0px", 'Property value is "0px"');
  body.style.setProperty("top", "unset");
  assert_equals(body.style.getPropertyValue("top"), "unset", 'Property value changed to "unset"');
});
</script>