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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<style>
div::first-letter {
color: lime;
background-color: lime;
}
</style>
<div>
A letter
</div>