ManualTests/animated-canvas-as-background.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <style>
 #container {
     width: 300px;
     height: 300px;
     background-image: -webkit-canvas(sourceCanvas);
     background-size: 100%;
     display: inline-block;
 }
 </style>
 </head>
 <body>
     <p>This test passes if two green squares are displayed below.</p>
     <div>
         <div style="display: inline-block">
             <div id="container"></div>
         </div>
         <div id="canvas-container" style="display: inline-block"></div>
     </div>
     <script>
         var ctx = document.getCSSCanvasContext('2d', 'sourceCanvas', 300, 300);
         var canvas = ctx.canvas;

         function asyncDraw2() {
             ctx.fillStyle = "green";
             ctx.fillRect(0, 0, 300, 300);
         }

         function asyncDraw1() {
             ctx.fillStyle = "red";
             ctx.fillRect(0, 0, 300, 300);
             window.webkitRequestAnimationFrame(asyncDraw2);
         }

         window.webkitRequestAnimationFrame(asyncDraw1);

         document.querySelector('#canvas-container').appendChild(canvas);
     </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<style>
	#container {
	width: 300px;
	height: 300px;
	background-image: -webkit-canvas(sourceCanvas);
	background-size: 100%;
	display: inline-block;
	}
	</style>
	</head>
	<body>
	<p>This test passes if two green squares are displayed below.</p>
	<div>
	<div style="display: inline-block">
	<div id="container"></div>
	</div>
	<div id="canvas-container" style="display: inline-block"></div>
	</div>
	<script>
	var ctx = document.getCSSCanvasContext('2d', 'sourceCanvas', 300, 300);
	var canvas = ctx.canvas;

	function asyncDraw2() {
	ctx.fillStyle = "green";
	ctx.fillRect(0, 0, 300, 300);
	}

	function asyncDraw1() {
	ctx.fillStyle = "red";
	ctx.fillRect(0, 0, 300, 300);
	window.webkitRequestAnimationFrame(asyncDraw2);
	}

	window.webkitRequestAnimationFrame(asyncDraw1);

	document.querySelector('#canvas-container').appendChild(canvas);
	</script>
	</body>
	</html>