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alpha.js Example File
script/context2d/scripts/alpha.js

 var ctx = document.getElementById('tutorial').getContext('2d');
   // draw background
   ctx.fillStyle = '#FD0';
   ctx.fillRect(0,0,75,75);
   ctx.fillStyle = '#6C0';
   ctx.fillRect(75,0,75,75);
   ctx.fillStyle = '#09F';
   ctx.fillRect(0,75,75,75);
   ctx.fillStyle = '#F30';
   ctx.fillRect(75,75,75,75);
   ctx.fillStyle = '#FFF';

   // set transparency value
   ctx.globalAlpha = 0.2;

   // Draw semi transparent circles
   for (i=0;i<7;i++){
       ctx.beginPath();
       ctx.arc(75,75,10+10*i,0,Math.PI*2,true);
       ctx.fill();
   }


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Qt 4.6.3