Flexbox is a CSS3 technology. This means it’s relatively new and some browsers don’t provide full support for flex properties.
Here’s a run-down:
IE 8 and 9 do not support flexbox. If you’re wanting to use flex properties in these browsers, don’t bother wasting your time. A flexbox polyfill made the rounds for a while, but it didn’t work well and is no longer maintained.
IE 10 supports a previous version of flexbox and requires vendor prefixes. Be aware that certain properties from the current spec aren’t supported in IE10 (such as
flex-basis). See the Flexbox 2012 Property Index.
IE 11 is good, but buggy. It’s based on the current flexbox standard. See the KNOWN ISSUES tab on this page for some of the problems. Also see: flex property not working in IE
With Chrome, Firefox and Edge you’re good all around. You’ll find minor bugs and inconsistencies but there are usually easy fixes. You’ll need to be aware of Implied Minimum Flex Sizing, which sometimes causes sizing and scrollbar problems.
Safari versions 9 and up support the current flexbox spec without prefixes. Older Safari versions, however, require
max-widthcause alignment problems which can be resolved with
flexequivalents. See Flex items not stacking properly in Safari
For a complete review of flexbox browser support, see this page:
For a quick way to add many (but not necessarily all) vendor prefixes use Autoprefixer. For Safari, see this article for
-webkit- prefixes that some prefix generators don’t include.
For a list of common flex bugs and their workarounds see Flexbugs.
Also, on this site, there’s:
- Flexbox Tag Info