[jaffathecake]

That document order thing doesn't sound right to me. Here's a demo where the popover appears before the anchor https://codepen.io/jaffathecake/pen/MYargba?editors=1100

[danielvaughn]

Interesting! I decided to reproduce the issue I saw, here it is:

https://codepen.io/danielvaughn/pen/myepyER?editors=1100

Maybe it has to do with multiple anchors?

Similar to your earlier comment, I don't know if this is a bug or is me just misunderstanding the spec.