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<!DOCTYPE html>
<html>
<body>
Pattern Canvas<br>
<canvas id="patternCanvas" style="border: 1px solid black" width="10" height="10"></canvas><br>
Main Canvas (red square should be in top-left corner)<br>
<canvas id="canvas" style="border: 1px solid black" width="100" height="100"></canvas>
<script>
// Draw a 10x10 red rectangle that will be used for the pattern.
const patternCanvas = document.getElementById("patternCanvas");
const patternCtx = patternCanvas.getContext("2d");
patternCtx.fillStyle = "red";
patternCtx.fillRect(0, 0, patternCanvas.width, patternCanvas.height);
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
const pattern = ctx.createPattern(patternCanvas, "no-repeat");
ctx.fillStyle = pattern;
// Fill the entire canvas with the pattern.
ctx.fillRect(0, 0, 100, 100);
</script>
</body>
</html>