Per http://lists.w3.org/Archives/Public/www-style/2014Aug/0308.html , there's been a change to the algorithm for getting the intrinsic sizes of a flex containers. The old text was something like "add up the hypothetical main sizes of the flex items". The new text is a bit more complex, and starts out: "For each flex item, subtract its flex basis from its max-content contribution size, then divide by its flex grow factor, floored at 1." The new algorithm is currently available here: http://dev.w3.org/csswg/css-flexbox-1/#intrinsic-sizes
OS: Linux → All
Hardware: x86_64 → All
Summary: Update intrinsic sizing of flex items to new spec text → Update intrinsic sizing of flex containers (e.g. container max-content width) to new spec text
Note the thread at https://lists.w3.org/Archives/Public/www-style/2015Apr/0049.html
fantasai suggested some further tweaks (to the max-content contribution of a flex item) here: https://lists.w3.org/Archives/Public/www-style/2015Jul/0429.html
This spec text is changing a bit further in https://github.com/w3c/csswg-drafts/issues/1735 , BTW.
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