<!DOCTYPE html>
<html>
<head>
<title>This tests that a non simple render backing layer with fractional CSS pixel size paints the background with no cruft.</title>
<head>
<style>
  div {
    background: green; 
    position: absolute;
    border: 0.5px solid red;
  }
</style>
</head>
<body>
<p id="container"></p>
<script>
  var container = document.getElementById("container");
  adjustment = 0.1;
  w = 2; h = 2;
  for (i = 0; i < 30; ++i) {
    adjustment += 0.1;
    for (j = 0; j < 40; ++j) {
      var e = document.createElement("div");
      e.style.top = ((w + 2) * i + j * adjustment) + "px";
      e.style.left = ((w + 2) * j + i * adjustment) + "px";
      e.style.width = w + "px";
      e.style.height = h + "px";
      container.appendChild(e);
      w += 0.01;
      h += 0.01;
    }
  }
</script>
</body>
</html>