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chromium/third_party/blink/web_tests/images/image-load-reset-on-new-base.html 

<!doctype HTML>
<iframe id="frame"></iframe>
<script>
if (window.testRunner)
  window.testRunner.waitUntilDone();
function done() {
  if (window.testRunner)
    window.testRunner.notifyDone();
}
function test() {
  const content = '<head><base href="resources/"></head><body>' +
    '<img src="base-test-resources/success.png" onload="parent.done()" onerror="parent.done()">' +
    '</body>';
  const doc = document.getElementById("frame").contentDocument;
  doc.firstChild.innerHTML = content;
}
window.onload = test;
</script>