Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Draw two rectangles on the canvas</title>
<style>
canvas{
border:1px solid gray;
}
</style>
<script async>
window.onload = init; // call init() once the window is completely loaded
function init(){
// #1 - get reference to <canvas> element
var canvas = document.querySelector('canvas');
// #2 - get reference to the drawing context and drawing API
var ctx = canvas.getContext('2d');
// #3 - all fill operations are now in red
ctx.fillStyle = 'red';
// #4 - fill a 100x100 rectangle at x=0,y=0
ctx.fillRect(0,0,100,100);
// #5 - all fill operations are now in green
ctx.fillStyle = 'green';
// #6 - fill a 50x50 rectangle at x=25,y=25
ctx.fillRect(25,25,50,50);
}
</script>
</head>
<body>
<canvas width=300 height=200>Your browser does not support canvas.</canvas>
</body>
</html>
This example looks like this:
