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Users without JavaScript (sorry, BrowserScript!) will load links as normal.

All the endpoints serve static html. I have no idea what the point in ajaxing it is (so you can stick in a pointless animation I guess). However it would degrade nicely, and search engines would be unaffected

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Loading the content resources with AJAX allow you to preserve the current UI state. Depending on your website and your needs this step might be completely unnecessary.

It becomes necessary when you have elements that you want to persist on your page. That might be an audio player or the state of a menu that you want to avoid painting.

It's just about a better UX for your users.

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