Got back into my blog with 3 posts related to UA sniffing and feature detection:

"Warning users on older browsers"
http://blog.pamelafox.org/2013/02/warning-users-on-older-browsers.html

"Why isn't our warning banner based on feature detection?"
http://blog.pamelafox.org/2013/02/why-isnt-our-warning-banner-based-on.html

"Checking for technical requirements in a sign-up process"
http://blog.pamelafox.org/2013/02/checking-for-technical-requirements-in.html

(Warning: my solutions are practical, not ideal).
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