Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/http/tests/printing/cross-site-frame-scrolled.html 

<!DOCTYPE html>
<style>
::-webkit-scrollbar { display: none }
</style>
<script>
if (window.testRunner)
  testRunner.setPrinting();
onload = function() {
  window.scrollBy(0, 150);
};
</script>
<iframe style="position: absolute; top: 200px; left: 200px"
    src="http://localhost:8080/printing/resources/subframe.html"></iframe>
<div style="height: 3000px"></div>