I write CSS + HTML. I use LESS, SASS, and vanilla CSS, depending on project. This is, professionally, nearly all I've done since 1997. Seeing iterations of browsers and OSes (that's a word, right? It's a word now) from IE5, Netscape and Windows to modern day devices and releases that dramatically affect how code is interpreted has set up a lasting habit of writing clean, non-hacky code.
I've taken OCD from a place of 'have to', to a place of 'do I get to?', focusing it on organization, naming policies that make sense and the DRY method of writing CSS. Every day is an adventure in code, every single discovery is as exciting as the first time I made something appear on a web page with just CSS. I absolutely LOVE what I do.
I've written CSS + HTML frameworks from the ground up for award-winning apps and websites, a Point of Sale system and backend product management. And very soon, I will take the writing I've done my entire life, and put it in a room with my experience with CSS + HTML. I have much to share.
Visit my Codepens