sphinx documentation validation process ?

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Hi, I would like to know the best method to check if the sphinx classes documentation or tutorials are properly designed. Then, some simple questions :

_once documentation has been compiled using make docs_html, how to ensure online documentation is valid before committing ? Some css, etc. can miss on the local machine so that rendering is different from the final online version.

_When do changes/commits appear on the online doc ?

Thanks a lot