Html5 specification

Hello, 

I have a question about HTML5 specification, 

Is this (mandatory ? | important ? | necessary ? ) to read all (or a part of) the previous HTML specifications (HTML 4.01, XHTML 1.1, ...) before to read (this) HTML5 specification OR not and is this possible to read (this) HTML5 specification directly without to read first all (or a part of) the previous HTML SPECIFICATIONS (HTML 4.01, XHTML 1.1, ...) ?

And the same thing about the CSS3 specification, 

Is this (mandatory ? | important ? | necessary ? ) to read all (or a part of) the previous CSS specifications (CSS1, CSS2) before to read (this) CSS3 specification OR not and is this possible to read (this) CSS3 specification directly without to read first all (or a part of) the previous CSS SPECIFICATIONS (CSS1,  CSS2) ?

Thank you for advance for your answer . 

Received on Tuesday, 28 February 2017 22:23:03 UTC