chromium/tools/perf/page_sets/simple_canvas/transfer_from_imageBitmap.html

<!DOCTYPE html>
<html>
<body>
<script>
var source = new OffscreenCanvas(2000, 1000);
var ctx = source.getContext("2d");
var destination = document.createElement('canvas');
var destinationCtx = destination.getContext('bitmaprenderer')
document.body.appendChild(destination);

function doRun() {
  ctx.fillRect(0, 0, 1, 1);
  var img = source.transferToImageBitmap();
  destinationCtx.transferFromImageBitmap(img);
  requestAnimationFrame(doRun);
}

window.onload = function () {
  doRun();
}

</script>
</body>
</html>