<!DOCTYPE HTML>
<html>
<head>
  <title>Media Queries with Zoom</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
</head>

<body>

<div>Testing media queries with different zoom levels</div>

<script type="application/javascript">

const originalDPR = window.devicePixelRatio;
const originalZoom = SpecialPowers.getFullZoom(window);

const zoomsToTest = [
300,
240,
200,
170,
150,
133,
120,
110,
100,
90,
80,
67,
50,
30,
];

for (let i = 0; i < zoomsToTest.length; ++i) {
  let zoomPercent = zoomsToTest[i];

  let relativeZoom = originalZoom * zoomPercent / 100;
  SpecialPowers.setFullZoom(window, relativeZoom);
  let actualZoom = SpecialPowers.getDeviceFullZoom(window);
  let targetDPR = (originalDPR * actualZoom);
  let actualDPR = window.devicePixelRatio;
  let mql = window.matchMedia(`(resolution: ${targetDPR}dppx)`);
  ok(mql.matches, `At ${zoomPercent}% zoom, target ${targetDPR}dppx matches ${actualDPR}dppx.`);
}

// Reset the zoom when the test is done.
SpecialPowers.setFullZoom(window, originalZoom);
</script>

</body>
</html>
