4 <canvas id=
"canvas" width=
"100" height=
"100"></canvas>
7 var canvas
= document
.getElementById('canvas');
8 var ctx
= canvas
.getContext('2d');
10 ctx
.fillStyle
= '#0f0';
11 ctx
.fillRect(0, 0, 100, 100);
14 ctx
.arc(50, 50, 25, 0, 2 * Math
.PI
);
17 ctx
.fillStyle
= '#f00';
19 ctx
.fillRect(0, 0, 100, 100);