LayoutTests/fast/inline/hidpi-select-inline-on-subpixel-position.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <title>This tests that inline text selection can paint to subpixel position.</title>
 <style>
   ::selection {
     background: rgba(255, 0, 0, 0.9);
   }

   div {
     font-size: 16px;
     width: 1px;
     height: 1px;
     position: fixed;
   }

 </style>
 </head>
 <body>
 <p id="container"></p>
 <script>
   var container = document.getElementById("container");
   adjustment = 0.1;
   for (i = 0; i < 10; ++i) {
     adjustment+=0.1;
     for (j = 0; j < 10; ++j) {
       var e = document.createElement("div");
       e.style.top = (30 * i + j * adjustment) + "px";
       e.style.left = (30 * j + i * adjustment) + "px";
       e.innerHTML = "foo";
       container.appendChild(e);
     }
   }

   var range = document.createRange();
   range.selectNode(document.getElementById("container"));
   window.getSelection().addRange(range);
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>This tests that inline text selection can paint to subpixel position.</title>
	<style>
	::selection {
	background: rgba(255, 0, 0, 0.9);
	}

	div {
	font-size: 16px;
	width: 1px;
	height: 1px;
	position: fixed;
	}

	</style>
	</head>
	<body>
	<p id="container"></p>
	<script>
	var container = document.getElementById("container");
	adjustment = 0.1;
	for (i = 0; i < 10; ++i) {
	adjustment+=0.1;
	for (j = 0; j < 10; ++j) {
	var e = document.createElement("div");
	e.style.top = (30 * i + j * adjustment) + "px";
	e.style.left = (30 * j + i * adjustment) + "px";
	e.innerHTML = "foo";
	container.appendChild(e);
	}
	}

	var range = document.createRange();
	range.selectNode(document.getElementById("container"));
	window.getSelection().addRange(range);
	</script>
	</body>
	</html>