User Experience / User Interface
search-engine-friendly (and people friendly) urls
routing through one php script so php isn’t exposed if php fails
fancy navigation
urls change as user navigates without refreshing/changing page
Instant search (search as user is typing)
errors show up as user is entering information (not when user presses save)
error validation is both client side and server side, so error messages are fast but server is still secure
no page reloading (i.e. no white flicker, no additional server request, not loading html that has already been loaded)
meta information (SEO, good practice)
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