Please consider supporting flexbox SAFE keyword

This value is recognised in Edge, but has no effect:

https://developer.mozilla.org/en-US/docs/Web/CSS/align-items#browser_compatibility

Example issue it brings when not implemented:

https://stackoverflow.com/questions/70094298/how-do-i-fix-scrolling-when-flexbox-content-is-vertically-centered/70094481#70094481