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Does this use the new moveBefore API to move DOM elements while preserving their state? Or is it going to recreate the elements eitherway due to React/Vue?

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I'd be surprised if it uses moveBefore for something that seems to have put so much thought into being portable. moveBefore doesn't even have an entry in MDN yet, the only references I can find to it suggest it's still only available behind a flag in Chrome canary.

It could support it as a progressive enhancement.

I personally wouldn't even bother with that yet.

Once it's available in even one browser not behind a flag, sure, but while it's still entirely undocumented and only available to people who both use Chrome Canary and know to go turn on a specific flag?

There are multiple ways in which you can specify how the panel renders.

https://dockview.dev/docs/core/panels/rendering

Options exist for multiple cases:

1. Where you never want the elements DOM position to move (`always` rendering mode) and the HTMLElement is simply hidden (display: none) when not visible. 2. Where you only want the DOM element to exist when the panel is visible (`onlyWhenVisible` mode)

In the case of React the React Tree is always maintained in either mode.

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