Can asp.net master page be a part of HTML 5?

Hi Everyone,
>From the time I started asp.net, I found the "master page" feature of
asp.net very useful. But always it seemed to me that it is not needed to
implement master pages at server side. Rather it would be better to leave
the tag to the client browser for handling. Then it can save some time also
as the whole page is not requested again and again. There will be no need to
use ajax/javascript explicitly for loading specific content of a page while
leaving the common part.

This may be a microsoft copyrighted thing. Then you can ask them to leave it
for HTML. Or some different tags/elements for using master page con be
introduced.

With Best regards,
Gulshanur Rahman