[theme-reviewers] User Agent Sniffing

[Devin Price]

I don't see any guidelines against user agent sniffing, but it seems 
like a bad practice to me especially when there are better methods for 
checking for IE versions.  Also, with the popularity of caching plugins 
it seems like enqueing scripts based on a user agent could cause 
issues.  Has there been a discussion of this in the past?  The theme I'm 
currently reviewing is here: https://themes.trac.wordpress.org/ticket/17401

Cheers,
Devin.