LayoutTests/fast/borders/hidpi-rounded-border-on-subpixel-position.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>This test if rounded rects on subpixel positions leave cruft behind.</title>
 <style>
   div {
     position: fixed;
   }

   .roundedRect {
 	border-width: 0px 0px 0px 1px;
 	border-style: solid;
 	border-top-left-radius: 1px;
 	border-color: black;
   }
 </style>
 </head>
 <body>
 <p id="container"></p>
 <script>
   var container = document.getElementById("container");
   adjustment = 0.1;
   w = 5; h = 5;
   for (i = 0; i < 20; ++i) {
     adjustment += 0.1;
     for (j = 0; j < 15; ++j) {
       var e = document.createElement("div");
       e.className = "roundedRect";
       e.style.top = ((w + 1) * i + j * adjustment) + "px";
       e.style.left = ((w + 1) * j + i * adjustment) + "px";
       e.style.width = w + "px";
       e.style.height = h + "px";
       container.appendChild(e);

       var p = document.createElement("div");
       p.style.top = ((w + 1) * i + j * adjustment) + "px";
       p.style.left = ((w + 1) * j + i * adjustment) + "px";
       p.style.width = w + "px";
       p.style.height = h + "px";
       p.style.borderLeft = "solid 1px white";
       container.appendChild(p);

       w += 0.1;
       h += 0.1;
     }
   }
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>This test if rounded rects on subpixel positions leave cruft behind.</title>
	<style>
	div {
	position: fixed;
	}

	.roundedRect {
	border-width: 0px 0px 0px 1px;
	border-style: solid;
	border-top-left-radius: 1px;
	border-color: black;
	}
	</style>
	</head>
	<body>
	<p id="container"></p>
	<script>
	var container = document.getElementById("container");
	adjustment = 0.1;
	w = 5; h = 5;
	for (i = 0; i < 20; ++i) {
	adjustment += 0.1;
	for (j = 0; j < 15; ++j) {
	var e = document.createElement("div");
	e.className = "roundedRect";
	e.style.top = ((w + 1) * i + j * adjustment) + "px";
	e.style.left = ((w + 1) * j + i * adjustment) + "px";
	e.style.width = w + "px";
	e.style.height = h + "px";
	container.appendChild(e);

	var p = document.createElement("div");
	p.style.top = ((w + 1) * i + j * adjustment) + "px";
	p.style.left = ((w + 1) * j + i * adjustment) + "px";
	p.style.width = w + "px";
	p.style.height = h + "px";
	p.style.borderLeft = "solid 1px white";
	container.appendChild(p);

	w += 0.1;
	h += 0.1;
	}
	}
	</script>
	</body>
	</html>