offscreencanvas-webgl-printing-expected.html

<!DOCTYPE html>
<canvas id='c'></canvas>
<script>
var can = document.getElementById('c');
can.width = can.height = 100;
var ctx = can.getContext("webgl");
ctx.clearColor(0, 1, 0, 1);
ctx.clear(ctx.COLOR_BUFFER_BIT);
if (window.testRunner) {
  testRunner.setPrinting();
}
</script>

chromium/third_party/blink/web_tests/printing/offscreencanvas-webgl-printing-expected.html