<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: white;
height: 1000px;
}
body.transparent {
background-color: rgba(0, 0, 0, 0.2);
</style>
<script>
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
function documentLoaded()
{
window.setTimeout(doTest, 0);
function appendLayerDump()
if (window.internals)
document.getElementById('output').textContent += window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_TILE_CACHES);
function doTest()
internals.setViewBaseBackgroundColor('transparent');
appendLayerDump();
document.body.classList.add('transparent');
document.body.classList.remove('transparent');
internals.setViewBaseBackgroundColor('white');
if (window.testRunner)
testRunner.notifyDone();
window.addEventListener('load', documentLoaded, false);
</script>
</head>
<body>
<p>Page tiles should be transparent if the body's background has alpha.</p>
<div id="test"></div>
<pre id="output"></pre>
</body>
</html>
