test_resize_flush.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1279202

-->

<head>

  <title>Test for Bug 1279202</title>

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

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

</head>

<body onload="run()">

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1279202">Mozilla Bug 1279202</a>

<iframe src="resize_flush_iframe.html" id="iframe" height="200" width="200" style="border:none"></iframe>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 1279202 **/

SimpleTest.waitForExplicitFinish();

function run() {

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

  var doc = iframe.contentDocument.documentElement;

  var win = iframe.contentWindow;

  var body = iframe.contentDocument.body;

  // Flush any pending layout changes before we start.

  var width = doc.clientWidth;

  // Resize the iframe

  iframe.width = '300px';

  // Flush pending style changes, but not layout ones. We do this twice because the first flush

  // does a partial flush of the resize (setting the size on the pres context) which sets the

  // need style flush flag again. The second call makes sure mNeedStyleFlush is false.

  var color = win.getComputedStyle(body).getPropertyValue("background-color");

  color = win.getComputedStyle(body).getPropertyValue("background-color");

  is(color, "rgb(0, 128, 0)", "Style flush not completed when resizing an iframe!");

  // Query the size of the inner document and make sure it has had a layout flush.

  width = doc.clientWidth;

  is(width, 300, "Layout flush not completed when resizing an iframe!");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>