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I'm using html5boilerplate with the Modernizr library. My application is built using jQuery. Both Modernizr and jQuery have feature detection built in, but my understanding is that Modernizr is more complete. I'm planning to use Modernizr for feature detection unless there is a good reason to use jQuery for this.
My application is intended to only work with more modern browsers (such as IE7+, Firefox, Chrome, Safari, and newer Opera), however it still works somewhat in IE6. I'd like to make sure the users see a big fat warning if they are using an older browser such as IE6. I'd also like to display a "suggestion" to upgrade to Chrome or some other HTML5 compliant browser if they are not using one already.
I don't want to use user agent testing.
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You say you're using HTML5Boilerplate. At the very top of the index.html is this:
<!-- paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/ -->
<!--[if lt IE 7 ]> <html lang="en" class="no-js ie6"> <![endif]-->
<!--[if IE 7 ]> <html lang="en" class="no-js ie7"> <![endif]-->
<!--[if IE 8 ]> <html lang="en" class="no-js ie8"> <![endif]-->
<!--[if IE 9 ]> <html lang="en" class="no-js ie9"> <![endif]-->
<!--[if (gt IE 9)|!(IE)]><!--> <html lang="en" class="no-js">
So using jQuery, plan old javascript or even css to simply test for the existence of the ie6 class on html.
<style>
.upgrade-notice { display: none; }
.ie6 .upgrade-notice { display: block; }
</style>
<div class="upgrade-notice"><h1>Please upgrade your browser</h1></div>
Use conditional comments for IE version testing.
<!--[if lt IE 7]><script>window.location='/main/unsupported_browser';</script><![endif]-->
As for the rest you should only test for features you use and only when you use them. That way you will degrade gracefully and won't accidently block a browser that works.
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