Fragment inside if (IS_BROWSER) doesn't replace an SSR-rendered else branch, keeping both rendered in the end about fresh HOT 3 OPEN

Something odd is going on. I can reproduce the issue, but haven't found the root cause yet.

from fresh.

@marvinhagemeister Doesn't preact need an actual DOM node to render in to? If the outer element of an island is just a Fragment, what gets passed to preact's root render function?

from fresh.

We always pass a fake dom node as the root element that doesn't exist in the actual Dom when reviving islands. It's been on invisible comment markers as the boundary. This is done to support sibling islands in the same container with potentially static nodes in between. It shouldn't matter what the outer element looks like.

from fresh.