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

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.