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chromium/third_party/blink/web_tests/external/wpt/css/mediaqueries/mq-calc-resolution.html 

<!DOCTYPE html>
<title>Test: support for calc resolution in Media Queries</title>
<link rel="help" href="http://www.w3.org/TR/css3-values/#calc-notation">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="calc resolution can be used in Media Queries">
<style>
  #test {
    width: 100px;
    height: 100px;
    background-color: red;
  }

  @media (resolution >= calc(2x - 96dpi)){
    #test {
      background-color: green;
    }
  }
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div id="test"></div>