<h1>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Tincidunt a gravida non, tincidunt condimentum nullam.
Aliquam mi augue, venenatis sed dolor eget. Aliquam venenatis felis, nullam ante est, nullam mattis massa nec nunc imperdiet convallis.</h1>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$("body").html($("body").html().replace(/dolor/gi, "<mark>dolor</mark>").replace(/nullam/gi, "<mark>nullam</mark>"));
</script>
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