According to http://dev.w3.org/csswg/css-flexbox/#flex-basis-property we should support the keyword "main-size" (and not auto).
<rdar://problem/18361231>
I don't see "man-size" in the W3C doc: https://drafts.csswg.org/css-flexbox/#flex-basis-property and WPT shows Safari Technology Preview 154 doing quite good: https://wpt.fyi/results/css?label=master&label=experimental&aligned&view=subtest&q=flex%20basis Is Spec changed and don't have "main-size" or WPT does not cover this? Thanks!