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<body bgcolor="orange">
<canvas width="300" height="300" id="testcase-canvas-dest"></canvas>
<script>
const kTransparent = "rgba(0%, 100%, 100%, 0.5)";
cx2 = document.getElementById('testcase-canvas-dest').getContext('2d');
cx2.fillStyle = kTransparent;
cx2.fillRect(0,0,100,20);
</script>
</window>