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<style>
::highlight(foo) {
color: blue;
background-color: cyan;
}
</style>
<span id='span-iframe'>abc</span>
<script>
let r = new Range();
r.setStart(document.querySelector('#span-iframe'), 0);
r.setEnd(document.querySelector('#span-iframe'), 1);
CSS.highlights.set('foo', new Highlight(r));
</script>