What is difference SEO differencence between:
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The exclamation point, eliminates the case of an empty hash like
The fragment identifier (when dealing with the URI of an HTML document) is supposed to be used to link to specific parts of a page. It isn't sent to the server.
In the last few years it has been used as a hack to maintain state information in websites that make heavy use of Ajax.
The use of a fragment identifier starting with a
The introduction of pushState eliminates the need for these hacks in modern browsers.
For browsers that don't support