DAPHNE: We finally caught the mean old Edge Browser! Now let's find out who you *really* are!
SCOOBY: Ruh-roh!
SHAGGY: Yoink!
DAPHNE: Gasp! It was Old Man Trident Rendering Engine all along!
VELMA: We could have worked it out from how Edge has exactly the same bugs and performance problems is IE!
OLD MAN TRIDENT: And I'd have got away with it if it wasn't for you pesky kids!

Ditch them completely.
In modern browsers you can emulate their behaviour easily.
They make your layout unnecessarily complex.
What the fuck am I talking about?

Tables in HTML. Fuck them. It may be just me and I still do not understand all of their defaults and when ti apply which style to which table element (thead, th, td...) but I found out that I can make almost everything with divs, flexbox or even some fixed widths or heights much easier to what I want than with tables.

Especially if you layout a complex scrolling component with static top row and static first column, it is nearly impossible with tables (and even without them you still need JS).

Ah, and fuck IE with a dirty trident. That thing can die in hell.