Running emacs 25.2.2.

Here is something (apparently) simple I want to do, but am unable to.

I am editing an html document. I want to `C-x 3` and open the same document in internal browser.

Now, if I make any changes to my html document, it gets reflected in this adjacent buffer.

I can `C-c C-v (browse-url-of-buffer)` but that does not help because there is no live preview.

How do I get this done?