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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>canvas</title>
<style>
#text{width:500px;height: 500px;}
</style>
<script type="text/javascript">
function draw(){
var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
cxt.moveTo(10,10);
cxt.lineTo(150,50);
cxt.lineTo(10,50);
cxt.stroke();
}
window.onload=draw();
</script>
</head>
<body>
<canvas id="myCanvas"></canvas>
</body>
</html>