How to solve the problem of cross-browser compatibility of the site yourself, without the help of a framework?

Question

css

One of the advantages of using a framework is that it takes on the task of cross-browser compatibility .
If you are not using a framework, how do you solve this problem?

Answer 1

Tyk

Answer 2

Answer from the cap:
I recognize non-cross-browser places of the program and rewrite them.
UPD: You can also write your own framework

Answer 3

use only what caniuse.com,
for example, I do all my layout on flexbox
, that is, browsers that do not support it, I do not support
if you focus only on normal browsers, then there are no problems with cross-browser compatibility,
the era of comfortable development has already come,
just don’t take on the work in which you need to support older browsers like IE9