chromium/chrome/test/data/gpu/feature_compositing_static.html

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>GPU Feature Testing: Accelerated Compositing</title>
<style>
body {
  transform: translateZ(0);
}
</style>
</head>
<body>
This page should trigger accelerated-compositing, i.e., gpu process should
 launch, if accelerated-compositing is allowed.
</body>
</html>