highlight-cascade-009.html

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This test has a WPT meta file that expects 3 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-pseudo/highlight-cascade/highlight-cascade-009.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>CSS Pseudo-Elements Test: highlight cascade: inheritance of custom properties</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">

<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/6641">

<meta name="assert" content="This test verifies that custom properties used in highlight pseudos are taken from the originating element.">

<script src="../support/selections.js"></script>

<link rel="stylesheet" href="../support/highlights.css">

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

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

<style>

  :root {

    --background-color: green;

    --decoration-color: green;

  ::selection {

    --decoration-color: purple;

  div::selection {

    --background-color: blue;

    background-color: var(--background-color, red);

</style>

<body>

  <div>Some text</div>

</body>

<script>

    selectNodeContents(document.querySelector("body"));

    const body_selection = getComputedStyle(document.querySelector("body"), "::selection");

    const div_selection = getComputedStyle(document.querySelector("div"), "::selection");

    test(() => void assert_equals(body_selection.getPropertyValue("--background-color"), "green"),

        "body ::selection uses the originating custom property");

    test(() => void assert_equals(body_selection.getPropertyValue("--decoration-color"), "green"),

        "body ::selection does not use its own custom property");

    test(() => void assert_equals(div_selection.getPropertyValue("--decoration-color"), "green"),

        "div::selection uses the originating element custom property");

    test(() => void assert_equals(div_selection.getPropertyValue("--background-color"), "green"),

        "div::selection does not use its own custom property");

</script>