JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

` ````
<body bgcolor="#000000">
<canvas id="canvas" height="768" width="768"></canvas>
</body>
```

` ````
#canvas {
position: absolute;
top:0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
```

` ````
var stats = new Stats();
stats.showPanel( 1 ); // 0: fps, 1: ms, 2: mb, 3+: custom
document.body.appendChild( stats.dom );
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.imageSmoothingEnabled = false;
ctx.mozImageSmoothingEnabled = false;
var smallcanvas = document.createElement('canvas');
var smallctx = smallcanvas.getContext('2d');
smallcanvas.width = 256; smallcanvas.height = 256;
var canvasHeight = smallcanvas.height;
var canvasWidth = smallcanvas.width;
var imageData = smallctx.getImageData(0, 0, canvasWidth, canvasHeight);
var buf = new ArrayBuffer(imageData.data.length);
var buf8 = new Uint8ClampedArray(buf);
var data = new Uint32Array(buf);
Math.clip = function(number, min, max) {
return Math.max(min, Math.min(number, max));
}
function pset(x, y, color) { //color object with properties a, r, g, b
//buffer overflows are quite costly. so we check to make sure the point is on the canvas
if(x > 0 && x < canvasWidth){
if(y > 0 && y < canvasHeight){
data[y * canvasWidth + x] =
(color.a << 24) | // alpha
((color.b) << 16) | // blue
((color.g) << 8) | // green
(color.r); // red
}
}
};
function line(x1, y1, x2, y2, color){
var dy = y2 - y1;
var dx = x2 - x1;
var stepx, stepy;
if (dy < 0) { dy = -dy; stepy = -1; } else { stepy = 1; }
if (dx < 0) { dx = -dx; stepx = -1; } else { stepx = 1; }
dy <<= 1; // dy is now 2*dy
dx <<= 1; // dx is now 2*dx
pset(x1,y1, color);
if (dx > dy)
{
var fraction = dy - (dx >> 1); // same as 2*dy - dx
while (x1 != x2)
{
if (fraction >= 0)
{
y1 += stepy;
fraction -= dx; // same as fraction -= 2*dx
}
x1 += stepx;
fraction += dy; // same as fraction -= 2*dy
pset(x1, y1, color);
};
} else {
fraction = dx - (dy >> 1);
while (y1 != y2) {
if (fraction >= 0) {
x1 += stepx;
fraction -= dy;
}
y1 += stepy;
fraction += dx;
pset(x1, y1, color);
}
}
};
function circle(xm, ym, r, color){
var x = -r, y = 0, err = 2-2*r; /* II. Quadrant */
do {
pset(xm-x, ym+y, color); /* I. Quadrant */
pset(xm-y, ym-x, color); /* II. Quadrant */
pset(xm+x, ym-y, color); /* III. Quadrant */
pset(xm+y, ym+x, color); /* IV. Quadrant */
r = err;
if (r <= y) err += ++y*2+1; /* e_xy+e_y < 0 */
if (r > x || err > y) err += ++x*2+1; /* e_xy+e_x > 0 or no 2nd y-step */
} while (x < 0);
};
function fillCircle(xm,ym,r,color){
var x = -r, y = 0, err = 2-2*r; /* II. Quadrant */
do {
line(xm-x, ym-y, xm+x, ym-y, color);
line(xm-x, ym+y, xm+x, ym+y, color);
r = err;
if (r <= y) err += ++y*2+1; /* e_xy+e_y < 0 */
if (r > x || err > y) err += ++x*2+1; /* e_xy+e_x > 0 or no 2nd y-step */
} while (x < 0);
}
function rect(x1, y1, x2, y2, color){
line(x1, y1, x2, y1, color);
line(x2, y1, x2, y2, color);
line(x1, y2, x2, y2, color);
line(x1, y2, x1, y1, color);
};
function fillRect(x1, y1, x2, y2, color){
var i = Math.abs(y2 - y1);
line(x1, y1, x2, y1, color);
while(--i){
line(x1, y1+i, x2, y1+i, color);
}
line(x1,y2, x2, y2, color);
}
var
num = 100,
m = 0,
c = 0,
s = 0,
cc = 0, ss = 0;
color1 = 0,
color2 = 0,
i = 0,
cx = 0, cy = 0,
dx = 0, dy = 0,
x1 = 0, x2 = 0,
y1 = 0, y2 = 0,
cir = [];
//i = 50;
//console.log(cir);
var loop = function(){
stats.begin();
m += .01;
//rendering
for(var x = 0; x < canvasWidth; x++){
for(var y = 0; y < canvasHeight; y++ ){
var value = x * y & 0xff;
pset(x,y, {r:0, g:0, b:value, a:255})
}
}
i = num;
while(--i){
//yellow lines
c = Math.floor(Math.cos(m+i) * 127);
s = Math.floor(Math.sin(m+i) * 127);
line(128+s,128+c,128-s,128-c, { r:255, g:200, b:0, a:255 });
}
rect(64,64,128+64, 128+64, { r:255, g:0, b:20, a:255 });
circle(127,127,32, { r:254, g:254, b:254, a:255 });
imageData.data.set(buf8);
smallctx.putImageData(imageData, 0, 0);
ctx.drawImage(smallcanvas, 0,0, 255, 255, 0,0, 767, 767);
stats.end();
requestAnimationFrame(loop);
}
loop();
```

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