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chromium/third_party/blink/web_tests/external/wpt/css/mediaqueries/mq-calc-sign-function-001.html 

<!doctype html>
<title>Test: support for calc with sign() in Media Queries</title>
<link rel="author" title="Daniil Sakhapov" href="mailto:[email protected]">
<link rel="help" href="http://www.w3.org/TR/css3-values/#calc-notation">
<link rel="help" href="http://www.w3.org/TR/css3-mediaqueries/#units">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
  :root {
    font-size: 16px;
  }
  div {
    width: 100px;
    height: 100px;
    background-color: red;
  }

  @media (width > calc(1px * (1 + sign(16px - 1rem)))) {
    div {
      background-color: green;
    }
  }
</style>

<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div></div>