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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-history-interface/pushstate-replacestate-empty-string/replacestate-base.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>history.replaceState() with an empty string URL and base URL different from document's URL</title>
<link rel="help" href="https://github.com/whatwg/html/issues/9343">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<base href="/the-base">

<script>
"use strict";

test(() => {
  const before = location.pathname;

  history.replaceState(null, null, "");
  assert_equals(location.pathname, before);
});
</script>