chromium/third_party/blink/web_tests/http/tests/devtools/extensions/resources/extensions-panel.html

<script>
function loadResources() {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "./missing.txt", false);
  xhr.send();
  var xhr = new XMLHttpRequest();
  xhr.open("GET", "../extensions-panel.js", false);
  xhr.send();
  var img = document.createElement("img");
  img.src = "./abe.png";
  document.body.appendChild(img);
}

function logMessage() {
  console.log("hello");
}
</script>