Created attachment 373651 [details] Safari https://jsbin.com/tunuzeb/4/edit?html,css,output The flex item `img` should preserve aspect ratio, e.g. see Chrome/Firefox.
Created attachment 373652 [details] Chrome/Firefox
<rdar://problem/53516815>
Will be fixed by patch in bug 209983 *** This bug has been marked as a duplicate of bug 209983 ***