title: HTML5 / Canvas "Glass" Circle
body: <p>I need to render a simple chart and I want the points to be glassy looking circles/orbs in the chart area.  I can find tons of examples of drawing these with Photoshop, but I don't want to use stock images; I'd prefer to draw them in my HTML5 canvas.  I am no artist, though!</p>
  
  <p>There are many HTML5 canvas questions, but I don't see anything that leads me to this solution.</p>
  
  <p>A point in the right direction would be most appreciated. </p>