test_meta_viewport_device_width.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>device-width in meta viewport</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

  <meta name="viewport" content="width=device-width">

  <script src="viewport_helpers.js"></script>

</head>

<body>

  <p>width=device-width</p>

  <script type="application/javascript">

    "use strict";

    add_task(async function device_width() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      let info = getViewportInfo(800, 480);

      is(info.width, 800, "width should be 800");

      is(info.height, 480, "height should be 480");

});

  </script>

</body>

</html>