<!DOCTYPE html>
<meta charset="UTF-8">
<title>pushState/replaceState on iframe with src set to URL that doesn't load a document (HTTP 204)</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<body></body>
<script>
/*
  When an iframe is created it will contain the initial empty document. If the
  src is set to a URL that doesn't load a new document (e.g. it results in a
  HTTP 204 response), it will st