html5 - Text drawn in HTML canvas has edges -

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i draw text "hello world" inside text couple of times inside 'canvas' in html5. outmost text red, next yellow, inside green text, , inner text blue.

what can sharp edges see on letter w?

how can make text render smoothly?

<canvas id="can" width="1200" height="500" dir="ltr">                 <script>                     var can = document.getelementbyid("can");                     var context = can.getcontext("2d");                     context.font = "200px arial";                     context.linewidth = 40;                     context.strokestyle = "red";                     context.stroketext("hello world", 25, 200);                     context.linewidth = 30;                     context.strokestyle = "yellow";                     context.stroketext("hello world", 25, 200);                     context.linewidth = 10;                     context.strokestyle = "lightgreen";                     context.stroketext("hello world", 25, 200);                     context.fillstyle = "blue";                     context.filltext("hello world", 25, 200);                 </script>                 </canvas>

this how text shown on screen

i not expert sorry cannot explain why , can tell linewidth doing w

i did made smoother 

<canvas id="can" width="1200" height="500" dir="ltr">                 <script>                     var can = document.getelementbyid("can");                     // used clearing canvas                     can.width = can.width;                     var context = can.getcontext("2d");                     context.font = "220px arial";                     context.linewidth = 11;                     context.strokestyle = "red";                     context.stroketext("hello world", 25, 202);                     context.linewidth = 10;                     context.strokestyle = "yellow";                     context.stroketext("hello world", 25, 202);                     context.linewidth = 4;                     context.strokestyle = "lightgreen";                     context.stroketext("hello world", 25, 200);                     context.fillstyle = "blue";                     context.filltext("hello world", 25, 200);                 </script>                 </canvas>

live demo http://jsfiddle.net/maree_chaudhry/wmsfb/1/

i know nt same still smooth if find better way solve please share me :)


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