LayoutTests/tiled-drawing/simple-document-with-margin-tiles.html - WebKit - Git at Google

 <!DOCTYPE html>

 <html>
 <head>
     <style>
         body {
             width: 1200px;
             height: 2000px;
             /* The setBackgroundShouldExtendBeyondPage setting will only create margin tiles for documents
                that have background images. */
             background-image:url(resources/greenbox.png);
             background-repeat:repeat;
         }
     </style>
     <script>
         if (window.testRunner) {
             testRunner.dumpAsText();
             testRunner.waitUntilDone();
         }

         function doTest()
         {
             if (window.internals)
                 window.internals.settings.setBackgroundShouldExtendBeyondPage(true);

             // FrameView::enableSpeculativeTilingIfNeeded() uses a 0.5s timer to enable speculative tiling.
             window.setTimeout(function() {
                 if (window.internals) {
                     document.getElementById('layers').innerText = internals.layerTreeAsText(document,
                         internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
                 }

                 if (window.testRunner)
                     testRunner.notifyDone();
             }, 550);
         }
         window.addEventListener('load', doTest, false);
     </script>
 </head>

 <body>
 <pre id="layers">Layer tree goes here</p>
 </body>
 </html>
	<!DOCTYPE html>

	<html>
	<head>
	<style>
	body {
	width: 1200px;
	height: 2000px;
	/* The setBackgroundShouldExtendBeyondPage setting will only create margin tiles for documents
	that have background images. */
	background-image:url(resources/greenbox.png);
	background-repeat:repeat;
	}
	</style>
	<script>
	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	function doTest()
	{
	if (window.internals)
	window.internals.settings.setBackgroundShouldExtendBeyondPage(true);

	// FrameView::enableSpeculativeTilingIfNeeded() uses a 0.5s timer to enable speculative tiling.
	window.setTimeout(function() {
	if (window.internals) {
	document.getElementById('layers').innerText = internals.layerTreeAsText(document,
	internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS \| internals.LAYER_TREE_INCLUDES_TILE_CACHES);
	}

	if (window.testRunner)
	testRunner.notifyDone();
	}, 550);
	}
	window.addEventListener('load', doTest, false);
	</script>
	</head>

	<body>
	<pre id="layers">Layer tree goes here</p>
	</body>
	</html>