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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<script type="application/x-javascript">
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var cvs = document.getElementById('canvas');
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var ctx = cvs.getContext('moz-gles11');
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ctx.clearColor(.2,.2,.2,1);
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ctx.clear(ctx.COLOR_BUFFER_BIT);
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<body onload="doload()">
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<canvas id="canvas" width="400" height="400" style="border: 2px solid black;"></canvas>