All the stuff you needed to know as a front-end developer in 2015 (HTML5, all the CSS modules, ARIA, vanilla JavaScript, and how to apply it all in a responsive, performant, accessible, progessively-enhanced manner). All that still applies. And now there's awesome stuff like this as well: https://webkit.org/blog/16794/the-css-shape-function/

Mind blown.

(And if your job is visual design rather than coding, you still need to know that stuff too.)

#css