hashchange - When using Ajax History and Bookmark, is it always good to use "#!" instead of just "#"? -

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facebook doing ajax history (back , forward button) , bookmark using #! instead of # in url. idea that, because thinking usual anchor interfere ajax history mechanism trigger processing normal anchor.

so, ajax history function process hash portion when sees #! instead of #.

and using ! compatible major browsers? if facebook using !, guess may supported.

see google's making ajax applications crawlable possible use case (don't know if why facebook used fragment).


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