LayoutTests/fast/canvas/hidpi-repaint-on-retina-leaves-bits-behind.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>This tests that we don't leave bits behind on the canvas context.</title>
 <style>
 </style>
 </head>
 <body>
 <canvas style="width: 100px; height: 100px" id="canvas" width="100" height="100"></canvas>
 <canvas style="width: 200px; height: 200px" id="stretchedCanvas" width="100" height="100"></canvas>
 <script>
     if (window.testRunner)
         testRunner.waitUntilDone();
     var ctx = canvas.getContext("2d");
     var stretchedCtx = stretchedCanvas.getContext("2d");
 	ctx.fillRect(1, 1, 50, 50);
 	stretchedCtx.fillRect(1, 1, 50, 50);
     setTimeout(function() {
 		ctx.clearRect(1, 1, 50, 50);
 		stretchedCtx.clearRect(1, 1, 50, 50);
 		if (window.testRunner)
 		   testRunner.notifyDone();
     }, 10);
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>This tests that we don't leave bits behind on the canvas context.</title>
	<style>
	</style>
	</head>
	<body>
	<canvas style="width: 100px; height: 100px" id="canvas" width="100" height="100"></canvas>
	<canvas style="width: 200px; height: 200px" id="stretchedCanvas" width="100" height="100"></canvas>
	<script>
	if (window.testRunner)
	testRunner.waitUntilDone();
	var ctx = canvas.getContext("2d");
	var stretchedCtx = stretchedCanvas.getContext("2d");
	ctx.fillRect(1, 1, 50, 50);
	stretchedCtx.fillRect(1, 1, 50, 50);
	setTimeout(function() {
	ctx.clearRect(1, 1, 50, 50);
	stretchedCtx.clearRect(1, 1, 50, 50);
	if (window.testRunner)
	testRunner.notifyDone();
	}, 10);
	</script>
	</body>
	</html>