The CSS Flexbox specification changed the algorithm for calculating a flexbox's intrinsic size (see below for the spec link). The new algorithm produces better results when there are flex items that actually flex, because it takes flex factors and flex-basis into account, whereas so far we just sum up the preferred sizes of each flex item.


Specification link

Specification being incubated in a Community Group

Status in Chromium


No active development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • Positive
  • No signal
  • No signals


Search tags

Flexbox, flex,

Last updated on 2020-12-07