[webkit-help] Fwd: Support for visibility: collapse for flexbox ?

[Eric Gorr]

See: https://css-tricks.com/almanac/properties/v/visibility/ for a
description of this property. It mentions that visibility: collapse should
be supported by flexbox as well.

Here is a code pen demonstrating the issue:

https://codepen.io/ericg97477/pen/NowWdv

It behaves correctly in Firefox 65.0, but not in the latest version of
safari.
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