HTML is a mark-up language, not a programming language, So what interface editor is highly used to modify HTML and CSS codes?

Answer 1

You can even usefully edit codes in browsers, which mostly provides 'developer' helpful tools with dynamic rendering on the fly ^^

Answer 2

you can even modify them in note pad because is just plane text but there are nice editors over there like Sublime Text, Dreamweaver, Atom, VS Code etc...

Answer 3

Personnaly, I use Notepad++ because it's in open source and you can dowload a lot of usefull plugin. But if realy want more I recommend you Dreamweaver CC : http://www.adobe.com/products/dreamweaver.html
It's a good editor for beginner because he's userfriendly. But he's not free ;)

Answer 4

Best editors for me:
Brackets (Free)
Sublime Text 3 (Paid)