I wonder how the search engines - Yahoo, bing, google ... - interpret the exclamation mark (!) in the url:
I could not find documentation on this topic
migrated from stackoverflow.com Jun 12 '11 at 14:11
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You're probably meaning the thingy documented by Google. It's called hash fragments or hash bangs (among other names), and it's very bad UI practice -- amongst other reasons, because a URI is permanent, and this lands you with a single url for your entire site.