This element unmounts the given snippet if the item isn't visible in the viewport and remounts it
when it becomes visible. This is useful for heavy list-based UIs that have a lot of items. You can
pass it either a Component to mount or a snippet (which gets wrapped and mounted).
The bleed value determines how far an element has to be outside of the view area before it gets
unmounted (specified in % of viewarea height). Higher values allow you to have a seamless
experience when scrolling at the cost of additional DOM elements.
Bleed: %
When you click in this box, it gains focus. When you click out, it loses focus.
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