Is it necessary to add the utf-8 to every file

Question

I have noticed that some people don't write it so I was wondering if its a most and what would be the consequences if I don't add it?

Answer 1

you can find your answer in yellow box at the bottom
https://www.sololearn.com/learn/HTML/2211/

Answer 2

In most cases , there is no change.

For more info : https://stackoverflow.com/questions/16505367/what-happens-when-we-dont-specify-meta-charset-utf-8

Answer 3

No, you dont have to, but its good thing you declare encryption method for browsers also you will have nicer script :)