Are we solving the information-centric transclusion problem,
or the design-centric asset reuse problem?
An iframe is fine for the former but is not geared towards design and layout solutions.
It kinda sucks for both! Dropping in a box of text that flatly does not resize to fit its contents does not fit the definition of "fine" for me, here.
You can do some really silly maneuvers with `window.postMessage` to communicate an expected size between the parent and frame on resize, but that's expensive and fiddly.
