This is an official website from Apple - Developer Documentation Archive. Its visuals have not been updated in who knows how long. Here you can even find early iPhone and iPhoneOS documentation. Pretty cool that it is still up, knowing that Apple hates old things. Although - it may be useful to some.

@snoah_05 meanwhile Microsoft keeps breaking 3 year old MS Docs links

@stackallocator Quite weird, considering that Microsoft is the one caring for compatibility of features. Most of the time.