<html>
  <head>
    <style type="text/css">
      html { background-color:threedface; overflow:scroll-indicator; }
      
      div.sample 
      { 
        flow:horizontal; 
        border-spacing:10px; 
        margin:10px 0;
      }
      div.sample widget.canvas 
      { 
        width:300px; height:*; 
        background-color: #fff;
        prototype:Canvas; /* see code below */
        border: 1px solid silver; 
      }
      div.sample pre.code 
      { 
        margin:0;
        padding:4px;
      