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I just cant see a way to support IE8 and below.
Having said that, I don't want to sniff the user agent because its bad practice and feature detection is a better alternative.

Would it be acceptable to wrap the entire content of my page in a conditional comment for IE9 and above therefore blocking IE legitimetelly? Or should I reconsider my plan?

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IE8 is the most popular version of IE for my website (with 11 being a close second), I wouldn't drop support for it lightly at this point. – Stephen Ostermiller Jan 23 '14 at 23:52
You'll probably want to mention\determine which features IE8 is missing that your site uses. Many missing features of older browsers have workarounds. – krowe Jan 24 '14 at 1:11
up vote 1 down vote accepted

This is entirely relative aka, it all depends. I've never had a case where I decided to give up on an IE version. Are you building with web standards? and testing? what's the major issue(s)?

A few thoughts:

No it is never acceptable to shut down browsers and shut out users. Never do that. Ok so you have to do it. Your plan to ice out < IE9 via cc is correct. Do that. Don't just serve up display:none. Give the user an explanation/context/link to newer versions, other browsers, etc.

Segue rant:

You are worried about best practices, so I have to point out that employing the best technical practices along with UX/UI practices is the way to go. Serving up nothing to a particular user is the worst thing you can do.

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IE8 gets a banner, IE7 and IE6 get blocked. thanks for your help – Ben Johnson mk2 Jan 24 '14 at 16:23
ah. serve the banner up for the other two. if you need help, share the url. – albert Jan 24 '14 at 17:06
tbf, when my site launches XP will be dead @albert – Ben Johnson mk2 Jan 24 '14 at 17:26
ah your missing the point(s). all hood. – albert Jan 24 '14 at 17:49

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