LayoutTests/fast/text/mark-matches-rendering-simple-lines.html

<p>
Quo usque tandem abutere, Catilina, patientia nostra?
</p>
<script>
if (window.internals) {
    internals.setMarkedTextMatchesAreHighlighted(true);
    internals.countMatchesForText("ti", [], "mark");
}
</script>