Can i combine both HTML and HTML 5 in building the structure of my webpage?

Question

webpage

Answer 1

What do you mean by combine both of them? Using some of the deprecated features in HTML 5?

Answer 2

Web browsers still support most deprecated elements like font, applet, frameset etc (I tried them in desktop browsers, not android ones) but they may become unsupported in the future. Some elements like basefont don't work even in desktop browsers.

Answer 3

yeah I mean using some of the deprecated features in HTML 5

Answer 4

I was about the tags in both of them...