To add to this, HTML 5/LS have a section on rendering HTML elements [1]. That section provides default CSS rules that a conforming web browser must use. Therefo

To add to this, HTML 5/LS have a section on rendering HTML elements [1]. That section provides default CSS rules that a conforming web browser must use. Therefore, modern browsers effectively have built-in normalize.css rules, providing a consistent web page default. There may be some rules you want to change in a set of baseline rules such as margin/padding, image sizing, and fonts. But those would be things you would add on top of normalize.css anyway. [1] https://html.spec.whatwg.org/multipage/rendering.html#rendering https://html.spec.whatwg.org/multipage/rendering.html#render...