Issue

--lexical-indent-base-value: 20px; not work, still 40px

Lexical version: 0.39.0

Steps To Reproduce

1. set :root { --lexical-indent-base-value: 20px; } not work

I think the bug is due to lexical use this code: getComputedStyle(dom).getPropertyValue('--lexical-indent-base-value')

because dom is not attached to the document, so the result is always empty and then will use the default 40px