HTML & CSS - Standards for the win!
I have a passion for writing semantic HTML and modern CSS. Writing
clean, short and understandable code with the standards at our
hands has some serious benefits for various reasons. One of them
is improving accessibility so that the experiences we create are
inclusive and take into account people's different abilities.
Another advantage is that the more standard compliant you are
working, the less you make yourself dependent on third party
solutions. Plus, your code is executable on all the major web
platforms (as you know that is not always the case but we are
getting there). There are still so many more reasons like SEO,
maintainability and so on...