<html>
 <head>
 <style>
 div { background: -webkit-canvas(squares); width:600px; height:600px; border:2px solid black }
 </style>
 <script>
if (window.testRunner)
    testRunner.dumpAsText();

function draw(w, h) {
 var ctx = document.getCSSCanvasContext("4d", "squares", w, h);
 if (ctx !== null)
    alert("FAIL! ctx wasn't null: " + ctx);
  alert("PASS");
}
 </script>
 </head>
 <body onload="draw(300, 300)">
   <div></div>
 </body>
</html>