2082349-1.html - mozsearch

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<!DOCTYPE html>

<head><meta charset="utf-8"></head>

<body>

<canvas id="canvas" width="50" height="50" style="background-color: #ff0000;"></canvas>

<script>

let ctx = canvas.getContext("2d", { get alpha() { canvas.getContext("2d", {alpha: false}); return true; }});

ctx.fillStyle = "rgba(0, 255, 0, 0.5)";

ctx.fillRect(0, 0, 50, 50);

</script>

</body>