Something that I think about and work on a lot is writing better CSS. Trial and error and reading have led me to adopting practices like declaring ...
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Setting max-width to 100% on images is good, it helps make websites responsive.
Also setting some default transitions on common elements can be useful. I like to set a transition for color, background-color and border on links, buttons, submit buttons.
Using something like normalize.css is good too. (github.com/necolas/normalize.css)
These are smart changes I definitely did not think about before! I've wondered about normalize as of late; I write in Gatsby a lot, and I've noticed their default
styles have gotten a lot more comprehensive, like they're added their own version of normalize. But even before that, it seemed like I didn't run into any odd cross-browser behavior on sites I was working on. I suppose it also matters how far back you need to go in terms of compatibility?