LayoutTests/compositing/iframes/iframe-size-from-zero.html - WebKit - Git at Google

 <!DOCTYPE html>

 <html>
 <head>
   <style type="text/css" media="screen">
     iframe {
         border: 10px solid black;
         padding: 5px;
         margin: 20px;
         height: 150px;
         width: 0;
     }

     .expanded {
       width: 300px;
     }

     .overlay {
       position: absolute;
       width: 50px;
       height: 50px;
       top: 5px;
       left: 5px;
       background-color: rgba(0, 0, 0, 0.2);
     }

   </style>
   <script type="text/javascript" charset="utf-8">
     if (window.testRunner) {
         testRunner.dumpAsText();
         testRunner.waitUntilDone();
     }

     function doTest()
     {
         window.setTimeout(function() {
             document.getElementById('iframe').className = 'expanded';
             // Need to wait for compositing layers to be updated.
             window.setTimeout(function() {
                 if (window.testRunner) {
                     document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
                     testRunner.notifyDone();
                 }
             }, 0);
         }, 0);
     }

     window.addEventListener('load', doTest, false);
   </script>
 </head>
 <body>

     <!-- The parent document may into compositing mode by the iframe. -->
     <iframe id="iframe" src="resources/composited-subframe.html"></iframe>

     <div class="overlay">
     </div>

     <pre id="layers">Layer tree appears here in DRT.</pre>
 </body>
 </html>
	<!DOCTYPE html>

	<html>
	<head>
	<style type="text/css" media="screen">
	iframe {
	border: 10px solid black;
	padding: 5px;
	margin: 20px;
	height: 150px;
	width: 0;
	}

	.expanded {
	width: 300px;
	}

	.overlay {
	position: absolute;
	width: 50px;
	height: 50px;
	top: 5px;
	left: 5px;
	background-color: rgba(0, 0, 0, 0.2);
	}

	</style>
	<script type="text/javascript" charset="utf-8">
	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	function doTest()
	{
	window.setTimeout(function() {
	document.getElementById('iframe').className = 'expanded';
	// Need to wait for compositing layers to be updated.
	window.setTimeout(function() {
	if (window.testRunner) {
	document.getElementById('layers').innerHTML = window.internals.layerTreeAsText(document);
	testRunner.notifyDone();
	}
	}, 0);
	}, 0);
	}

	window.addEventListener('load', doTest, false);
	</script>
	</head>
	<body>

	<!-- The parent document may into compositing mode by the iframe. -->
	<iframe id="iframe" src="resources/composited-subframe.html"></iframe>

	<div class="overlay">
	</div>

	<pre id="layers">Layer tree appears here in DRT.</pre>
	</body>
	</html>