This text should not be autosized, as this div is the lowest common ancestor of the root cluster, and this div is narrow.
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
This text should be autosized to 40px computed font size (16 * 800/320) since it's wider than the lowest common ancestor of its enclosing cluster so it becomes a cluster itself.
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.