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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Highlight API Test: </title>
<link rel="match" href="custom-highlight-painting-below-target-text-ref.html">
<meta name="assert" value="Style properties defined in a ::highlight shouldn't be overriden by default values if there's another pseudo overlay painted on top of it (::target-text in this case) which doesn't specify a value for that property (color in this case)">
<style>
::highlight(foo) {
color:limegreen;
background-color:yellow;
}
::target-text {
background-color:orange;
}
</style>
<body>Some text
<script>
let r = new Range();
r.setStart(document.body.firstChild, 0);
r.setEnd(document.body.firstChild, 7);
CSS.highlights.set("foo", new Highlight(r));
window.location.href = `custom-highlight-painting-below-target-text.html#:~:text=text`;
</script>