test_meta_viewport_change_name_among_multiple.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>name attribute changes among multiple meta viewport tags</title>

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

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

  <meta name="viewport" content="width=980">

  <meta id="viewport" name="initial-name" content="width=device-width, initial-scale=1">

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

</head>

<body>

  <script>

    "use strict";

    add_task(async function change_name_attribute() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      let viewport = document.getElementById("viewport");

      let info = getViewportInfo(800, 480);

      // The "width=980" content is a valid one.

      fuzzeq(info.defaultZoom, 800/980, "initial scale is calculated based on width");

      is(info.minZoom,     0.25,     "minimum scale defaults to the absolute minimum");

      is(info.maxZoom,     10,       "maximum scale defaults to the absolute maximum");

      is(info.width,       980,      "width is the default width");

      is(info.height,      588,      "height is proportional to displayHeight");

      // Now the second meta tag is a valid viewport.

      viewport.setAttribute("name", "viewport");

      info = getViewportInfo(800, 480);

      is(info.defaultZoom, 1, "initial zoom is 1");

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

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

      // Now it's invalid again, but it's retained.

      viewport.setAttribute("name", "other");

      info = getViewportInfo(800, 480);

      is(info.defaultZoom, 1, "initial zoom is 1");

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

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

});

  </script>

</body>

</html>