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    \$\begingroup\$ Nobody cares if your HTML validates at codegolf :-) Some improvements: <canvas id=c> and then c.getContext. Shorten loops: for(x=k=128;x--;)for(y=k;y--;) \$\endgroup\$ Commented Jun 9, 2012 at 15:47
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    \$\begingroup\$ ids being turned into global variables is a horrible misfeature which I refuse to acknowledge, and WebKit does not implement it in standards mode. Thank you for the loop trick. \$\endgroup\$ Commented Jun 9, 2012 at 16:53
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    \$\begingroup\$ Minor improvement: x&y?0: can be replaced with x&y|| Otherwise nice solution. \$\endgroup\$ Commented Jun 10, 2012 at 11:20
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    \$\begingroup\$ Bravo, this is just wonderful. \$\endgroup\$ Commented Jun 14, 2012 at 7:17
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    \$\begingroup\$ As this contains a script, I'd recommend titling it as HTML + Javascript. That'll make it clearer to someone skimming what sort of answer it is. \$\endgroup\$ Commented Nov 23, 2016 at 21:31