feature: flexbox status: use tags: gtie9 kind: css
Flexbox has a funny history: the flexbox spec changed significantly through three major revisions (Chris Coyier shares how to tell which flexbox you're looking at). The current version is supported by all modern browsers. If you need to support IE 10 however you can mix old and new flexbox for maximum browser support.
Flexbugs is another valuable resource to discover flexbox issues and cross-browser workarounds.