Table of contents in sidebar feels wonky

[rparrett]

I saw that mentioned in Discord… but no idea if there is an GH issue.

I just checked, and it's working fine, but since we have a fixed header it feels weird (?). It probably gets fixed if we change the top part in rootMargin in the intersection observer. Probably needs the header height and that's it, which can be accessed with getComputedStyle(document.body).getPropertyValue('--header-height').

wonky-sidebar.mp4

Originally posted by @doup in #1907 (comment)