alt Hacker NewsI understand your point, but I still think it is bad from the point of view of language paradigms[1]. Iframes should have not been created in the first place.. You are changing the purpose of the language while it was not made for it.
(yes in my view I interpret includes as a basic procedure)
[1] http://www.info.ucl.ac.be/people/PVR/paradigmsDIAGRAMeng201....
There is nothing procedural about includes. In fact, it first appeared before HTML even became popular in Xanadu, called transclusion:
https://en.wikipedia.org/wiki/Transclusion