LayoutTests/fast/canvas/pattern-too-large-to-create.html - WebKit - Git at Google

 <body>
 <script>
 if (window.testRunner)
     window.testRunner.dumpAsText();

 var canvas = document.createElement("canvas");
 canvas.width = 100;
 canvas.height = 100;

 // Make a pattern so large that it will fail to be allocated.
 var patternCanvas = document.createElement("canvas");
 patternCanvas.width = 300000;
 patternCanvas.height = 300000;

 var ctx = canvas.getContext("2d");
 var pattern;
 try {
     pattern = ctx.createPattern(patternCanvas, "repeat");
 } catch (e) {
     if (e.code == DOMException.INVALID_STATE_ERR)
         document.body.appendChild(document.createTextNode("PASS: Saw exception."));
 }

 // The remainder of this code doesn't really matter, since pattern is null.
 ctx.rect(0, 0, canvas.width, canvas.height);
 ctx.fillStyle = pattern;

 ctx.fill();
 </script>
	<body>
	<script>
	if (window.testRunner)
	window.testRunner.dumpAsText();

	var canvas = document.createElement("canvas");
	canvas.width = 100;
	canvas.height = 100;

	// Make a pattern so large that it will fail to be allocated.
	var patternCanvas = document.createElement("canvas");
	patternCanvas.width = 300000;
	patternCanvas.height = 300000;

	var ctx = canvas.getContext("2d");
	var pattern;
	try {
	pattern = ctx.createPattern(patternCanvas, "repeat");
	} catch (e) {
	if (e.code == DOMException.INVALID_STATE_ERR)
	document.body.appendChild(document.createTextNode("PASS: Saw exception."));
	}

	// The remainder of this code doesn't really matter, since pattern is null.
	ctx.rect(0, 0, canvas.width, canvas.height);
	ctx.fillStyle = pattern;

	ctx.fill();
	</script>