test_meta_viewport7.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>meta viewport test</title>

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

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

  <meta name="viewport" content="width=320">

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

</head>

<body>

  <p>Dynamic viewport updates</p>

  <script type="application/javascript">

    "use strict";

    add_task(async function test1() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      updateViewport("width=device-width");

      let info = getViewportInfo(800, 480);

      is(info.defaultZoom, 1,    "initial zoom is 100%");

      is(info.width,       800,  "width is the same as the displayWidth");

      is(info.height,      480,  "height is the same as the displayHeight");

      is(info.autoSize,    true, "width=device-width enables autoSize");

      is(info.allowZoom,   true, "zooming is enabled by default");

      info = getViewportInfo(900, 600);

      is(info.width,       900,  "changing the displayWidth changes the width");

      is(info.height,      600,  "changing the displayHeight changes the height");

});

    add_task(async function test2() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      updateViewport("width=320");

      let info = getViewportInfo(800, 80);

      is(info.defaultZoom, 2.5,   "initial zoom fits the displayWidth");

      is(info.width,       320,   "width is set explicitly");

      is(info.height,      40,   "height is at the absolute minimum");

      is(info.autoSize,    false, "width=device-width enables autoSize");

      is(info.allowZoom,   true,  "zooming is enabled by default");

      info = getViewportInfo(480, 800);

      is(info.defaultZoom, 1.5,   "initial zoom fits the new displayWidth");

      is(info.width,       320,   "explicit width is unchanged");

      is(info.height,      533,   "height changes proportional to displayHeight");

});

    add_task(async function test3() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      updateViewport("user-scalable=no");

      let info = getViewportInfo(800, 480);

      is(info.allowZoom,   false, "zooming is explicitly disabled");

});

    add_task(async function test4() {

      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));

      updateViewport("user-scalable=yes");

      let info = getViewportInfo(800, 480);

      is(info.allowZoom,   true,  "zooming is explicitly allowed");

});

    function updateViewport(content) {

      let meta = document.querySelector("meta[name=viewport]");

      meta.content = content;

  </script>

</body>

</html>