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chromium/third_party/blink/web_tests/fast/canvas/OffscreenCanvas-resize-and-transform-expected.html 

<!DOCTYPE html>
<html>
<head></head>
<body>
  <canvas id="myCanvas" width="512" height="256"></canvas>
  <div id="log"></div>
</body>
<script>
const canvas = document.getElementById("myCanvas");
ctx = canvas.getContext("2d");

ctx.translate(120, 60);
ctx.scale(2, 1);
ctx.rotate(Math.PI/8);

ctx.fillStyle = "#ff00aa";
ctx.fillRect(-40, -40, 40, 40);
ctx.fillStyle = "#ffaa00";
ctx.fillRect(0, -40, 40, 40);
ctx.fillStyle = "#00aaff";
ctx.fillRect(0, 0, 40, 40);
ctx.fillStyle = "#00ff00";
ctx.fillRect(-40, 0, 40, 40);
</script>
</html>