3 <script type=
"text/javascript">
4 window
.onload = function() {
5 var ctx
= document
.getElementById("c1").getContext("2d");
6 ctx
.mozFillRule
= "evenodd";
7 ctx
.rect(50, 50, 200, 200);
8 ctx
.rect(100, 100, 100, 100);
12 ctx
.fillRect(0, 0, 300, 300);
17 <div><canvas id=
"c1" width=
"300" height=
"300"></canvas></div>