The Matrix Console in JS

index.html

<canvas id="q"></canvas>

matrix.css

* {
  margin: 0;
  padding: 0;
  border: 0;
}

body {
  background: #dff;
  font: 30px sans-serif;
}

matrix.js

// forked from skopp's "forked: the-matrix" http://jsdo.it/skopp/vEBP
// forked from teetteet's "forked: the-matrix" http://jsdo.it/teetteet/fiiz
// forked from dongriab's "the-matrix" http://jsdo.it/dongriab/c56Z

var s = window.screen;
var width = q.width = s.width;
var height = q.height = s.height;
var letters = Array(256).join(1).split('');

var draw = function () {
  q.getContext('2d').fillStyle='rgba(0,0,0,.05)';
  q.getContext('2d').fillRect(0,0,width,height);
  q.getContext('2d').fillStyle='#0F0';
  letters.map(function(y_pos, index){
    text = String.fromCharCode(3e4+Math.random()*33);
    x_pos = index * 10;
    q.getContext('2d').fillText(text, x_pos, y_pos);
    letters[index] = (y_pos > 758 + Math.random() * 1e4) ? 0 : y_pos + 10;
  });
};
setInterval(draw, 33);