Steps to reproduce: 1. Open any page in Chrome Frame under IE9 e.g. http://quirksmode.org/frametest.html 2. Add #123 to URL (http://quirksmode.org/frametest.html#123) and press Enter. 3. Note that the first time window.location will be updated correctly: ... hash: "#123" href: "http://quirksmode.org/frametest.html#123" ... 4. Now change the hash e.g. to #1234 (http://quirksmode.org/frametest.html#1234) and press Enter 5. Window location object is not updated. Result: window.location.hash is still "123" and window.location.href is "http://quirksmode.org/frametest.html#123" Expected: window.location.hash should be "1234" and window.location.href should be "http://quirksmode.org/frametest.html#1234" Window location object will be updated only first time when user changes hash part of URL or pastes links with hashes to the same page more than once.