test_viewport_units.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=804970

-->

<head>

  <title>Test for dynamic changes to CSS 'vh', 'vw', 'vmin', and 'vmax' units</title>

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

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

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=804970">Mozilla Bug 804970</a>

<iframe id="iframe" src="viewport_units_iframe.html"></iframe>

<pre id="test">

<script type="application/javascript">

/** Test for CSS vh/vw/vmin/vmax units **/

function px_to_num(str)

    return Number(String(str).match(/^([\d.]+)px$/)[1]);

function width(elt)

    return px_to_num(elt.ownerDocument.defaultView.getComputedStyle(elt).width);

SimpleTest.waitForExplicitFinish();

function run() {

    var iframe = document.getElementById("iframe");

    var idoc = iframe.contentDocument;

    var vh = idoc.getElementById("vh");

    var vw = idoc.getElementById("vw");

    var vmin = idoc.getElementById("vmin");

    var vmax = idoc.getElementById("vmax");

    iframe.style.width = "100px";

    iframe.style.height = "250px";

    is(width(vh), 250, "vh should be 250px");

    is(width(vw), 100, "vw should be 100px");

    is(width(vmin), 100, "vmin should be 100px");

    is(width(vmax), 250, "vmax should be 250px");

    iframe.style.width = "300px";

    is(width(vh), 250, "vh should be 250px");

    is(width(vw), 300, "vw should be 300px");

    is(width(vmin), 250, "vmin should be 250px");

    is(width(vmax), 300, "vmax should be 300px");

    iframe.style.height = "200px";

    is(width(vh), 200, "vh should be 200px");

    is(width(vw), 300, "vw should be 300px");

    is(width(vmin), 200, "vmin should be 200px");

    is(width(vmax), 300, "vmax should be 300px");

    SimpleTest.finish();

window.addEventListener("load", run);

</script>

</pre>

</body>

</html>