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chromium/third_party/blink/web_tests/external/wpt/css/css-color/t32-opacity-offscreen-with-alpha-c.xht 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>CSS Test: opacity</title>
		<link rel="author" title="L. David Baron" href="https://dbaron.org/" />
		<link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
		<link rel="help" href="http://www.w3.org/TR/css3-color/#transparency" />
		<link rel="match" href="t32-opacity-offscreen-with-alpha-c-ref.html" />
		<meta name="assert" content="That alpha within the offscreen buffer is composited correctly." />
		<meta name="fuzzy" content="0-1;0-5120" />
		<style type="text/css"><![CDATA[

		body { background: white; }

		div { width: 5em; height: 1em; }
		div.top { margin: 2px 0; }

		]]></style>
	</head>
	<body>
		<p>The following four boxes should be the same color:</p>

		<div class="top" style="background: rgb(204, 204, 255)"></div>
		<div class="top" style="opacity: 0.2; background: rgb(0, 0, 255)"></div>
		<div class="top" style="opacity: 0.5"><div style="opacity: 0.4; background: rgb(0, 0, 255)"></div></div>
		<div class="top" style="opacity: 0.4"><div style="background: rgba(0, 0, 255, 0.5)"></div></div>
	</body>
</html>