File: highlight-cascade-010.html

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<!doctype html>
<meta charset="utf-8">
<title>CSS Pseudo-Elements Test: highlight styling: late property registration updates highlights</title>
<link rel="author" title="Stephen Chenney" href="mailto:schenney@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-cascade">
<meta name="assert" value="This test verifies that custom property values when defined on a highlight pseudo update when the property registration happens after first style recalc.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
    #originating::spelling-error {
        color: white;
        --x: initial;
        background-color: var(--x, red);
    }
</style>
<div id="originating">Text wth a spelling error</div>
<script>
  promise_test(async () => {
    await new Promise(requestAnimationFrame);
    CSS.registerProperty({
      name: '--x',
      inherits: true,
      initialValue: "green"
    });
    await new Promise(requestAnimationFrame);
    const originating_spelling = getComputedStyle(document.querySelector("div"), "::spelling-error");
    assert_equals(originating_spelling.getPropertyValue("--x"), "green");
  }, "the custom property receives its initial value from a deferred registration");
</script>