After fighting years against IE6¹, when IE7 came bantering in with its Compatibilty Mode, I gave up and moved to backend work. Spending weekend-allnighters to get this one rounded-corner-drop-shadow working is depressing.
¹ a real-life lesson in monopolism: IE6 was around for over 14 years!
Stuff like 99% support flexbox and high % for grid makes working with layout so good.
Only wish "gap" property would be adopted easier to make working collapsing flex rows way easier.
Even the basic things like :last-child selector is good quality-of-life improvement.
All those dirty hacks you needed to do to make stuff work make me so thankful for today's wonderful CSS, even when it frustrates me.