You should be safe with IE11 and above.
You can find more info here about what you might need to do if you want to support even older browsers.
That link has a lot of good information in it, thanks! It also made me think more about reasons to/not support IE at all.
I love CSS custom properties and there is no way (to my knowledge) to get support for that in IE11.
If you can leave IE11 behind, leave it.
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