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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-history-pushState.html 

<!DOCTYPE html>
<title>History state change for iframe loading='lazy' before it is loaded: history.pushState</title>
<iframe data-src="about:blank#push" src="support/blank.htm?src" loading="lazy" hidden></iframe>
<script>
const iframe = document.querySelector('iframe');
const iframeLoaded = new Promise(resolve => {
  iframe.onload = resolve;
});
let pushStateSuccess = true;
try {
  // Should have no effect on lazy-loading.
  // Per https://html.spec.whatwg.org/C#can-have-its-url-rewritten
  // only the fragment can be changed for about: URLs.
  iframe.contentWindow.history.pushState(null, "", iframe.dataset.src);
} catch(ex) {
  pushStateSuccess = false;
}
const locationAfterPushState = iframe.contentWindow.location.href;
iframe.hidden = false;
</script>
<!-- Loading testharness.js here is intentional to reproduce a bug in WebKit. -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup({single_test: true});
assert_true(pushStateSuccess);
assert_equals(locationAfterPushState, new URL("about:blank#push", location.href).href);
iframeLoaded.then(() => {
  // No timeout needed in this test because history.pushState() doesn't navigate.
  assert_equals(iframe.contentWindow.location.href, new URL("support/blank.htm?src", location.href).href);
  done();
});
</script>