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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<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>