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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS test reference</title>
<style>
div {
white-space: pre;
font-family: monospace;
tab-size: 8; /* the initial value, but since we're measuring against it, we might as well be sure */
}
</style>
<p>Test passes if the 4 letters bellow are vertically aligned.
<div> P</div>
<div> A</div>
<div> S</div>
<div> S</div>