Can Canvas Elements Be Used as CSS Backgrounds?

<div>
  <style>
    div {
      background: -webkit-canvas(squares);
      width: 600px;
      height: 600px;
      border: 2px solid black;
    }
  </style>

  <script type="application/x-javascript">
    function draw(w, h) {
      var ctx = document.getCSSCanvasContext("2d", "squares", w, h);

      ctx.fillStyle = "rgb(200, 0, 0)";
      ctx.fillRect(10, 10, 55, 50);

      ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
      ctx.fillRect(30, 30, 55, 50);
    }
  </script>
</div>

<p>