Checker interface covers Back To Top module widget

Indeed.

I think the best thing here because of the late fade-in is to use CSS to move the back to top widget instead, so you don't get a weird floatie-thing going where Editoria11y is sorta vaguely centered before the other widget appears. Something like:

body:has(ed11y-element-panel) #backtotop {
  margin-right: 140px;
}

I'm a little loathe to add that sort of thing in my module, since I'd be moving their widget; might be good to ask Back to Top to add an offset parameter?

Here's a related issue suggesting a setting to fix it: ✨ Allow configuring the widget position Active

That's a good idea. I'll track my work in #3521111.

timwood -- I'd recommend making the same feature request in back-to-top. Because that displays late I've seen it have issues with other modules. They are welcome to yoink my code.

Great, thank you @itmaybejj!