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copied!<p><sub><strong>This answer is very outdated</strong>, but it was very relevant back then in the stone age.</sub></p> <p>I think feature detect is more usefull than navigator.userAgent parsing, as I googled Opera ambiguosity <a href="http://www.javascriptkit.com/javatutors/navigator.shtml" rel="nofollow noreferrer" title="here">here</a>. Nobody can know if IE16 will parse the /MSIE 16.0;/ regexp - but we can be quite sure, there will be the document.all support. In real life, the features are usually synonyms for the browsers, like: <em>"No XMLHttpRequest? It is the f....d IE6!"</em> No nonIE browser supports document.all, but some browsers like Maxthon can scramble the userAgent. (Of course script can define document.all in Firefox for some reason, but it is easilly controllable.) Therefore I suggest this solution.</p> <p><strong>Edit</strong> <a href="http://www.javascriptkit.com/javatutors/objdetect3.shtml" rel="nofollow noreferrer" title="Here">Here</a> I found complete resources.</p> <p><strong>Edit 2</strong> I have tested that document.all is also supported by Opera!</p> <pre><code>var is = { ff: window.globalStorage, ie: document.all && !window.opera, ie6: !window.XMLHttpRequest, ie7: document.all && window.XMLHttpRequest && !XDomainRequest && !window.opera, ie8: document.documentMode==8, opera: Boolean(window.opera), chrome: Boolean(window.chrome), safari: window.getComputedStyle && !window.globalStorage && !window.opera } </code></pre> <p>Using is simple:</p> <pre><code>if(is.ie6) { ... } </code></pre>

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