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<!DOCTYPE html>
<html>
<body>
<canvas id="A" width=200 height=50></canvas><br />
<canvas id="B" width=200 height=50></canvas>
<script>
var canvasA = document.getElementById("A"),
ctxA = canvasA.getContext('2d'),
canvasB = document.getElementById("B"),
ctxB = canvasB.getContext('2d'),
width = canvasA.width,
height = canvasA.height;
ctxB.fillStyle = 'red';
ctxB.fillRect(0, 0, width, height);
</script>
</body>
</html>
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