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Test Info:

<!DOCTYPE html>
<meta charset=UTF-8>
<title>CSS Test: perspective(0)</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Google" href="http://www.google.com/">
<meta name="assert" content="perspective: 0 should be clamped to 1px">
<link rel="match" href="reference/green.html">
<style>
#outer {
width: 100px;
height: 100px;
background: red;
perspective: 0;
perspective-origin: top left;
}
#inner {
width: 50px;
height: 50px;
background: green;
/* perspective: 0 should be treated as perspective(1px), which should
* cause this box to be much larger. */
transform: translateZ(0.5px);
}
</style>
<p>Pass if there is NO red below:</p>
<div id="outer"><div id="inner"></div></div>