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    <p>It could be detected in both, by examining the User-Agent string. Note that browsers can spoof their UA string, but this is rarer now than in the past. See <a href="http://msdn.microsoft.com/en-us/library/ms537503(VS.85).aspx" rel="nofollow noreferrer">this article on MSDN</a> for older UA strings.</p> <p>Note also that IE8 sends a different UA string in Compatibility mode and in Standards mode (see <a href="http://www.user-agents.org/cgi-bin/csv2html.pl?data=allagents.csv&amp;template=detail.html&amp;match=%5Cbid_moz_080209_2%5Cb" rel="nofollow noreferrer">this</a> and <a href="http://www.user-agents.org/cgi-bin/csv2html.pl?data=allagents.csv&amp;template=detail.html&amp;match=%5Cbid_moz_080209_3%5Cb" rel="nofollow noreferrer">this</a> - both are IE8, although the former says <code>MSIE 7.0</code>).</p> <p>See <a href="http://www.user-agents.org/index.shtml?moz" rel="nofollow noreferrer">this</a> for a long list of UA strings - note that you should be looking for a pattern, not exact match, as installed software will modify the UA string.</p> <p>IE9 has some new UA string thing - <a href="http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx" rel="nofollow noreferrer">see the IEBlog for details</a>.</p> <p>To summarize (and borrow from <a href="https://stackoverflow.com/users/126229/ericlaw-msft">@EricLaw</a>'s comment):</p> <ul> <li>no Trident in UA string - check the <code>MSIE [0-9].0</code> string for version</li> <li>Trident/4.0 - IE 8, version in <code>MSIE</code> is not relevant</li> <li>Trident/5.0 - IE 9</li> </ul>
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