Considere agregar un atributo Lang a la etiqueta HTML Start para declarar el lenguaje de este documento.
Well, it depends on what your code is for. If you're coding a real website, you should
include the lang attribute because it's good for SEO. If you're making it for personal
use, you really don't need to.
TL;DR: If it's goin' on the web, use it. Otherwise, you don't have to.
Repr