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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<canvas id="canvas"></canvas>
<script>
let canvas = document.getElementById("canvas");
canvas.width = 10;
canvas.height = 32767;
let context = canvas.getContext('2d');
context.fillStyle = "red";
context.fillRect(0, 0, 10, 10);
</script>
</body>