style-set-custom-property.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/style-set-custom-property.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Setting value for custom property</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/3878 -->

<div id="div" class="div"></div>

<script>

"use strict";

test(() => {

  const div = document.getElementById("div");

  div.style.setProperty("--x", 0);

  div.style.setProperty("--x", 1);

  assert_equals(div.style.getPropertyValue("--x"), "1", 'Property value is "1"');

  assert_equals(div.style.length, 1, "style.length is 1");

  assert_equals(div.style.item(0), "--x", 'style.item(0) is "--x"');

  assert_equals(div.style.item(1), "", "style.item(1) is empty string");

});

</script>