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<!DOCTYPE html>
<style>
::highlight(highlight1) {
text-underline-offset: 1cqw;
text-decoration-line: underline;
text-decoration-color: green;
text-decoration-thickness: 2cqh;
}
</style>
<div id="h1">With container size</div>
<script>
let r1 = new Range();
r1.setStart(h1, 0);
r1.setEnd(h1, 1);
CSS.highlights.set("highlight1", new Highlight(r1));
</script>