<!DOCTYPE html>
<html>
<head>
<title>This tests that we can subpixel position textareas properly.</title>
<style>
  textarea {
    width: 9px;
    height: 9px;
    position: fixed;
    margin: 0px;
    padding: 0px;
    border: 0.5px solid black;
 }
 
 div {
    width: 5px;
    height: 5px;
    position: fixed;
    background: green;
 }
</style>
</head>
<body>
<p id="container"></p>
<script>
  var container = document.getElementById("container");
  adjustment = 0.2;
  w=20; h=20;
  for (i = 0; i < 15; ++i) {
    adjustment+=0.1;
    for (j = 0; j < 15; ++j) {
      var e = document.createElement("textarea");
      var topLeftY = ((w + 10) * i + j * adjustment);
      var topLeftX = ((w + 10) * j + i * adjustment);
      e.style.top = topLeftY + "px";
      e.style.left = topLeftX + "px";
      e.style.width = w + "px";
      e.style.height = h + "px";
      container.appendChild(e);

      var cover = document.createElement("div");
      cover.style.top = (topLeftY + h - h/2 + 1) + "px";
      cover.style.left = (topLeftX + w - w/2 + 1) + "px";
      cover.style.width = w/2 + "px";
      cover.style.height = h/2 + "px";
      container.appendChild(cover);

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