Why doesn't Discourse use position:sticky for the top header?

[notriddle (Michael Howell)]

Using position:sticky can help avoid a cornucopia of jank bugs related to slowly-dispatched scroll events and measuring things. Here’s another one:

Timeline Positioning Responds Slowly until Mouse Clicked, Overlap Issue

I’m not sure if this began occurring with the new update or prior, but now when I scroll down a longer topic, the post number on the timeline scroller remains the same until I click my left mouse button or wait for what seems like an extended length of time. Additionally, when I scroll up to reach the top of the post, the timeline scroller overlaps my global notice (as seen in the screenshot below). [image] And here’s a GIF of the bug caught in the act (you can see it snaps back once I click…

I admit it’s not a big deal, but it would provide actual improvements for browsers that support it, not just warm fuzzies.