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This snippet generate matrix falling code. I got it by unobfuscate those code. Look at it it's impressive : http://timelessname.com/sandbox/matrix.html
<html>
<head>
<script language="javascript">
function matrix_on_load()
{
s=window.screen,w=q.width=s.width,h=q.height=s.height,m=Math.random;
// Initialize the number of columns
for(p=[],i=0;i<256;p[i++]=0);
setInterval('matrix_interval()',33)
}
function matrix_interval()
{
//At each iteration, we overwrite the surface with a mask black with alpha channel to 5%
q.getContext('2d').fillStyle='rgba(0,0,0,.05)';
q.getContext('2d').fillRect(0,0,w,h);
// The next letter will be draw in flash green
q.getContext('2d').fillStyle='#0F0';
// v : value in p
// i : index
p.map(function(v,i){
q.getContext('2d').fillText(String.fromCharCode(3e4+m()*33),i*10,v);
if(v>758+m()*1e4)
{
p[i]=0;
}
else
{
p[i]+=10;
}
});
}
</script>
</head>
<body style=margin:0 onload="matrix_on_load()"><canvas id=q />
</html>
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