LayoutTests/fast/repaint/hidpi-device-pixel-based-repaint-rect-tracking.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>This tests that repaint rect tracking works for hiDPI cases.</title>
 <head>
 <style>
   div {
     position: absolute;
     border: green solid 1px;
     width: 20px;
     height: 20px;
     left: 0px;
     top: 0px;
   }
 </style>
 </head>
 <body>
 <div id=foo></div>

 <script>
   function move() {
     document.getElementById("foo").style.left = "1.5px";
     if (window.testRunner) {
         var dummy = document.body.offsetTop;
         var repaintRects = window.internals.repaintRectsAsText();
         window.internals.stopTrackingRepaints();

         var pre = document.createElement('pre');
         document.body.appendChild(pre);
         pre.innerHTML = repaintRects;
         testRunner.notifyDone();
       }
   }

   if (window.testRunner && window.internals) {
     window.testRunner.dumpAsText(false);
     window.internals.startTrackingRepaints();
     testRunner.waitUntilDone();
   }

   setTimeout(move, 0);
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>This tests that repaint rect tracking works for hiDPI cases.</title>
	<head>
	<style>
	div {
	position: absolute;
	border: green solid 1px;
	width: 20px;
	height: 20px;
	left: 0px;
	top: 0px;
	}
	</style>
	</head>
	<body>
	<div id=foo></div>

	<script>
	function move() {
	document.getElementById("foo").style.left = "1.5px";
	if (window.testRunner) {
	var dummy = document.body.offsetTop;
	var repaintRects = window.internals.repaintRectsAsText();
	window.internals.stopTrackingRepaints();

	var pre = document.createElement('pre');
	document.body.appendChild(pre);
	pre.innerHTML = repaintRects;
	testRunner.notifyDone();
	}
	}

	if (window.testRunner && window.internals) {
	window.testRunner.dumpAsText(false);
	window.internals.startTrackingRepaints();
	testRunner.waitUntilDone();
	}

	setTimeout(move, 0);
	</script>
	</body>
	</html>