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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/overlapping-navigations-and-traversals/same-document-nav-same-document-nav.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Same-document navigation after a same-document navigation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<!--
  These tests are kind of silly since it's hard to imagine any other result:
  same-document navigations are always synchronous so of course two in a row
  will succeed.

  Nevertheless they're nice as a basis from which to write corresponding app
  history tests, where the consequences aren't as obvious.
-->

<body>
<script type="module">
import { createIframe } from "./resources/helpers.mjs";

promise_test(async t => {
  const iframe = await createIframe(t);

  iframe.contentWindow.location.hash = "#1";
  assert_equals(iframe.contentWindow.location.hash, "#1");

  iframe.contentWindow.location.hash = "#2";
  assert_equals(iframe.contentWindow.location.hash, "#2");
}, "fragment navigation then fragment navigation");

promise_test(async t => {
  const iframe = await createIframe(t);

  iframe.contentWindow.history.pushState(null, "", "?1");
  assert_equals(iframe.contentWindow.location.search, "?1");

  iframe.contentWindow.history.pushState(null, "", "?2");
  assert_equals(iframe.contentWindow.location.search, "?2");
}, "pushState() then pushState()");

promise_test(async t => {
  const iframe = await createIframe(t);

  iframe.contentWindow.history.pushState(null, "", "?1");
  assert_equals(iframe.contentWindow.location.search, "?1");

  iframe.contentWindow.location.hash = "#2";
  assert_equals(iframe.contentWindow.location.search, "?1");
  assert_equals(iframe.contentWindow.location.hash, "#2");
}, "pushState() then fragment navigation");

promise_test(async t => {
  const iframe = await createIframe(t);

  iframe.contentWindow.location.hash = "#1";
  assert_equals(iframe.contentWindow.location.hash, "#1");

  iframe.contentWindow.history.pushState(null, "", "?2");
  assert_equals(iframe.contentWindow.location.search, "?2");
  assert_equals(iframe.contentWindow.location.hash, "");
}, "fragment navigation then pushState()");
</script>