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Test Info:

<!DOCTYPE html>
<style>
::highlight(test) { background-color: yellow; }
</style>
<div aria-invalid="grammar" id="div1">This are a dog</div>
<script>
const div1 = document.getElementById("div1");
const text_node = div1.firstChild;
const range = document.createRange();
range.setStart(div1, 0);
range.setEnd(div1, 1);
const highlight = new Highlight(range);
CSS.highlights.set("test", highlight);
</script>