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<!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 ::root if not found in the highlight inheritance chain.">
<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: purple;
}
::selection {
--decoration-color: green;
}
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 has the root custom property");
test(() => void assert_equals(body_selection.getPropertyValue("--decoration-color"), "green"),
"body ::selection uses its own custom property");
test(() => void assert_equals(div_selection.getPropertyValue("--decoration-color"), "green"),
"div::selection inherits a custom property");
test(() => void assert_equals(div_selection.getPropertyValue("--background-color"), "blue"),
"div::selection uses its own custom property");
</script>
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