Render's replaceNode Argument Ignored

Reproduction

I spotted in the docs for the render that you can supply an optional third argument replaceNode which will be diffed during the initial render. It seems in the most recent version that this behaviour does not work.

In this CodePen for version 10.4.1 I would expect the placeholder span to be replaced with the bar component. Instead the bar component is prepended into the container.

The last version I could find which had the behaviour described in the docs was v8.5.3 (CodePen).

Steps to reproduce

• Load up this CodePen using version 10.4.1
• Observe that once the bar component renders the placholder text App hasn't started. is still present on the page.

Expected Behavior

As per this CodePen using version v8.5.3 and from the docs i expected the replace node to be removed from the DOM during the initial render.

Actual Behavior

The placeholder span passed into render as the replaceNode was not removed from the DOM.

[JoviDeCroock]

In Preact X, replaceNode (as does hydration) expects your dom to be equal else it has to fallback to a regular render. Which is something we haven’t implemented yet. if you’d render a span in your example instead of a div you would see the expected result. We might want to document this

[jaybeeuu]

No need for thanks. Thanks for the library and support!