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.
This is in related to the publication of the package to npm. All of the publications are verified with provenance statements as supported by NPM directly; it's something I believe all NPM packages should be required to use but as of now it's optional; it simply provided verifiable signatures as to what was built and how it was built.
