IE7 ignores CSS attribute selector only on pages coming from production server

Question

On my website, IE7 seems to be ignoring certain CSS attribute selectors. The strange thing is that it only happens when the page comes from the production server. If I have the

Answer 1

I see that one page is .html and the other is .php. It might be possible that your php page has some character (maybe hidden) before the doctype. It could make a difference on how IE accepts HTML and CSS.