How to track what changes have been made in the code?

Question

HTML

There are 2 files with code, different editions, one of them is supplemented, is there a plugin that highlights changes in 2 files?

Answer 1

Any IDE does this as long as you use source control.
If not, then try this tool: https://www.diffchecker.com/

Answer 2

I used the standard tools of Total Commander - comparing 2 files by content, where you can compare and edit