title: Multiple hash signs in URL
body: <p>Or maybe you call it &quot;sharp&quot; - the # symbol.</p>
  <p>I've came across one instance, where #! and # used simultaneously in a single URL. From reading other articles, including RFC, I can't understand whether that is a legal combination or not. When encountering such page Mozilla browser (Iceweasel in this case) displays the URL as having 2 #'s, while Chrome displays only one, but dies shortly afterwards (the tab containing the page becomes unresponsive and crashes - but it may not be connected).</p>
  <p>Now, my question is, is it legal to have both in one URL, is it maybe legal and redundant (should be normalized), or is it just a bug in Mozilla browser? So, suppose I'm making an AJAX request, or trying to navigate the browser history - what should I do, if I encounter this situation?</p>
  <p><img src="https://i.stack.imgur.com/GILtn.png" alt="double hash in url" /></p>
  <p>RFC-3986: <a href="https://www.rfc-editor.org/rfc/rfc3986#section-3.4" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc3986#section-3.4</a> , which should be clarifying it... just in case.</p>
  <p>Also: <a href="https://developers.google.com/webmasters/ajax-crawling/docs/specification" rel="nofollow noreferrer">https://developers.google.com/webmasters/ajax-crawling/docs/specification</a> how Google crawlers see things.</p>