Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<body>

<span>Without clip():</span>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
// Draw a rectangle
ctx.rect(50, 20, 200, 120);
ctx.stroke();
// Draw red rectangle
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 150, 100);
</script> 

<span>With clip():</span>
<canvas id="myCanvas2" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c = document.getElementById("myCanvas2");
var ctx = c.getContext("2d");
// Clip a rectangular area
ctx.rect(50, 20, 200, 120);
ctx.stroke();
ctx.clip();
// Draw red rectangle after clip()
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 150, 100);

</script> 

</body>
</html>