iframe-loading-lazy-history-replaceState.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-history-replaceState.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>History state change for iframe loading='lazy' before it is loaded: history.replaceState</title>

<iframe data-src="about:blank#replace" src="support/blank.htm?src" loading="lazy" hidden></iframe>

<script>

const iframe = document.querySelector('iframe');

const iframeLoaded = new Promise(resolve => {

  iframe.onload = resolve;

});

let replaceStateSuccess = 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.replaceState(null, "", iframe.dataset.src);

} catch(ex) {

  replaceStateSuccess = false;

const locationAfterReplaceState = 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(replaceStateSuccess);

assert_equals(locationAfterReplaceState, new URL("about:blank#replace", location.href).href);

iframeLoaded.then(() => {

  // No timeout needed in this test because history.replaceState() doesn't navigate.

  assert_equals(iframe.contentWindow.location.href, new URL("support/blank.htm?src", location.href).href);

  done();

});

</script>