Browsers' default CSS for HTML elements

Question

Where can I find a browser\'s default CSS for HTML elements?

Many HTML elements come with some default CSS properties which can sometimes result in

Answer 1

No one has mentioned any source for the CSS defaults in Edge. I looked, and I couldn't find anything authoritative, but I found this stylesheet that looks plausible: https://gist.github.com/jonathantneal/abc52743caa0a019d359ec4ba2ce965b