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CSS Containment Level 1, 2017 (w3.org/TR/2017/WD-css-contain-1-20170221/) says: By itself, size containment does not offer much optimization opportunity. Its primary benefit… to lay out the containing element’s contents based on the containing element’s size… without fear of "infinite loops" ScottKellum/1360346224625262595
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On the outside it may look like we suddenly "solved it" all at once. But more accurately, the csswg has been laying essential groundwork for this feature over several years, with a lot of people contributing ideas. Thanks to that work, we now have a clearer path to the finish.