Reflow

This is very precise, and it is what we need.

Opinions?

The arrangement of containers of perceivable objects in a document in the
generated source for that document at any given time in the execution of
the document, must be a proper reading order for the document. In addition,
if all the author’s style is removed from the document, then the document
will appear as a linear arrangement of these containers in the linear order
described above.