In vertical flexbox (e.g. `display: flex; flex-direction: column`), fixed-sized elements (i.e. not flex) that are placed after a flex-sized elements are not repositioned if their size has changed (e.g. by setting the text content of the fixed-sized element). In this example, the bottom fixed-sized div gets it's text (and thus given height) after initially layout which is not accounted for (as of WebKit Nightly r208586): http://jsbin.com/hururo/edit?html,output Expected: The flex-sized element is resized, and the text appears inside the box. Actual: The text appears outside the box.
<rdar://problem/29464651>
This is some kind of invalidation issue, since resizing (e.g., via Command +) fixes the layout to be correct.
Fixed by changes to merge in with Blink code.