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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body { font-size: 16px; }
div { position: absolute; font-size: 0.9em; width: 8em; }
.mask { background: green; }
span { display: inline-block; font-weight: bold; width: 4em; }
</style>
<p>There should be no red:<p>
<div class=mask><span>foo</span></div>