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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-event-iframe-element.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<title>"load" event fires on the iframe element when loading the initial empty document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<body></body>
<script>
"use strict";

promise_test(async t => {
  const iframe = document.createElement("iframe");
  let loadCount = 0;
  iframe.addEventListener("load", () => {
    loadCount++;
  });
  document.body.appendChild(iframe);
  assert_equals(loadCount, 1);
}, "load event fires synchronously on <iframe> element created with no src");

promise_test(async t => {
  const iframe = document.createElement("iframe");
  iframe.src = "";
  let loadCount = 0;
  iframe.addEventListener("load", () => {
    loadCount++;
  });
  document.body.appendChild(iframe);
  assert_equals(loadCount, 1);
}, "load event fires synchronously on <iframe> element created with src=''");

promise_test(async t => {
  const iframe = document.createElement("iframe");
  iframe.src = "about:blank";
  let loadCount = 0;
  iframe.addEventListener("load", () => {
    loadCount++;
  });
  document.body.appendChild(iframe);
  assert_equals(loadCount, 1);
}, "load event fires synchronously on <iframe> element created with src='about:blank'");

promise_test(async t => {
  const iframe = document.createElement("iframe");
  iframe.src = "about:blank#foo";
  let loadCount = 0;
  iframe.addEventListener("load", () => {
    loadCount++;
  });
  document.body.appendChild(iframe);
  assert_equals(loadCount, 1);
}, "load event fires synchronously on <iframe> element created with src='about:blank#foo'");

promise_test(async t => {
  const iframe = document.createElement("iframe");
  iframe.src = "about:blank?foo";
  let loadCount = 0;
  iframe.addEventListener("load", () => {
    loadCount++;
  });
  document.body.appendChild(iframe);
  assert_equals(loadCount, 1);
}, "load event fires synchronously on <iframe> element created with src='about:blank?foo'");
</script>