<!DOCTYPE html><!-- webkit-test-runner [ CSSPaintingAPIEnabled=true ] -->

<style>
canvas {
  display: block;
}
</style>

<canvas id="paint" style="width: 150px; height: 150px;" ></canvas>
<canvas id="paint2" style="width: 150px; height: 150px;" ></canvas>

<script id="code">
for (canvasID of ['paint', 'paint2']) {
  const canvas = document.getElementById(canvasID);
  canvas.width = 150 * window.devicePixelRatio;
  canvas.height = 150 * window.devicePixelRatio;

  const ctx = canvas.getContext('2d');
  ctx.scale(window.devicePixelRatio, window.devicePixelRatio);

  for (var i = 0; i < 6; i++){
    for (var j = 0; j < 6; j++){
      ctx.fillStyle = 'rgb(' + Math.floor(255 - 42.5 * i) + ',' +
                       Math.floor(255 - 42.5 * j) + ',0)';
      ctx.fillRect(j * 25, i * 25, 25, 25);
    }
  }
}
</script>