[bezbac]

I can totally understand the quoted comment. I mean, we are talking about CSS as a language here. Anything that is formalized is expected to be implemented and supported by browser engines and vendors. Browser engines are already extremely complex, so it's fair to think closely about formalizing new things when it's not apparent that there is a big enough need.

I'm not claiming this is the case with the Mansory layout; I just understand that adding unnecessary complexity for a small target user base is a valid concern.

[paulhilbert]

I totally get that. But for me there is a fundamental difference between "big enough need" and "well known websites need this".

How are potentially thousands of niche websites less of an argument than "instagram and co don't need it"?

[The_Colonel]

Well-known == highly visited == native implementation will have large accumulated impact on end users (their performance, energy consumption, improved usability ...).