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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Highlight API Test: Overlapping Highlights</title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<link rel="match" href="custom-highlight-painting-overlapping-highlights-002-ref.html">
<meta name="assert" value="UAs must not define any styles for custom highlight pseudo-elements in the default UA stylesheet.">
<style>
div {
font-size: 3em;
font-weight: bolder;
}
#affected1::highlight(highlight1) {
color: green;
background-color: rgb(0, 255, 0, 0.5);
}
#affected2::highlight(highlight2) {
color: red;
background-color: rgba(100, 0, 100, 0.5);
}
</style>
<body><div><span id="affected1">Green on lime.</span><span id="affected2">Red on maroon.</span></div>
<script>
/*
This test is meant to verify that:
- UAs must not define any styles for custom highlight pseudo-elements in
the default UA stylesheet.
- UAs do not paint unstyled custom highlights.
In this test, highlight1 has higher priority, so it is painted over
highlight2. This includes painting for span#affected2, where there is no CSS
rule for highlight1. But since unstyled custom highlights are not painted,
span#affected2 is still painted with the styles for highlight2.
See https://drafts.csswg.org/css-highlight-api-1/#default-styles
*/
const div = document.querySelector("div");
let r = new Range();
r.setStart(div, 0);
r.setEnd(div, 2);
let r2 = new Range();
r2.setStart(div, 0);
r2.setEnd(div, 2);
let h = new Highlight(r);
h.priority = 3;
let h2 = new Highlight(r2);
h2.priority = 2;
CSS.highlights.set("highlight1", h);
CSS.highlights.set("highlight2", h2);
</script>
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