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chromium/third_party/blink/web_tests/fast/media/mq-pixel-ratio-expected.html 

<html>
<body>
<p style="color: green">This text should be green if the resolution scaling factor is 1.0, purple if the scaling factor is 1.5,
red if the scaling factor is 2.0, and black otherwise.</p>
</body>
</html>