FIO: Box alignment rules, new level 3

A short time ago someone posted a question concerning text content alignment, in which in my reply i mentioned that apart from css flexbox and grid layout, a new css module was being published containing specs for new alignment rules including -

align-content: left;

well here it is, (finally) -

https://www.w3.org/TR/2017/WD-css-align-3-20170906/

This is just for information to everyone interested in knowing what is already available and planned for browser support, (only rely on grid/flexbox spec rules being well supported at this time) and not intended for discussion, though if anyone wishes to add anything constructive, please feel free to do so.