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<!doctype html>
<title>CSS Test Reference</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<style>
#outer {
border: 10px solid transparent;
}
#inner {
border: 10px solid;
}
</style>
<div id="outer"><div id="inner"></div></div>