Is it acceptable to add ‘special,’ but unnecessary, content based on a user’s web browser? For example, is it okay to display this:
at the top of my webpage for all IE users?
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Acceptable to whom? I personally think it’s a sign of a rather lame site — it’s up there with that little construction guy sign from 1998 (remember that one?).
You sure can, if you want, but it’s better to make your site as compliant as possible, and to use tools like YUI and jQuery to make your site more browser-agnostic.