NEW 70782
Implement visibility:collapse for new flexboxes 
https://bugs.webkit.org/show_bug.cgi?id=70782
Summary Implement visibility:collapse for new flexboxes
Ojan Vafai
Reported 2011-10-24 16:59:15 PDT
The current spec text is "Similar to table cells, flexbox items respond specially to the ‘collapse’ value of the ‘visibility’ property. When a flexbox item is set to ‘visibility: collapse;’, the item does not generate a box at all (identical to setting ‘display: none;’)." There's a bit of controversy over whether this is the right thing to do: http://lists.w3.org/Archives/Public/www-style/2011Oct/0136.html. If we could get away with changing visibility:collapse across the board without compat problems, that would clearly be best.
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Ojan Vafai
Comment 1 2012-02-10 12:24:35 PST
The spec has changed to not mention visibility:collapse at all, which means that we should treat it as visibility:hidden. I expect this just works right now, but we should add some tests to verify.
Ojan Vafai
Comment 2 2012-05-23 13:54:26 PDT
The spec has changed to require special visibility:collapse behavior. http://dev.w3.org/csswg/css3-flexbox/#visibility-collapse I don't especially love this behavior, but I don't care enough to argue it.
Tony Chang
Comment 3 2013-02-26 16:38:28 PST
Here's a test case: http://plexode.com/u/#2J%222I%3E2H%3CEG8world29%3AfGHbrIr7*1459!16hello(E6JIf5!-webkit-flexr4px!solid!blue%3Br*!!)Jborder9!n)Hdiv!style%3Dn(H%2FdivI%0A2!%20~http://plexode.com/eval3/#ht=)Jdisplay95%3B6%0A7*14!visibility9collapse68G(7( Basically, the middle div should have 0 width, but the height of the flexbox should be unchanged. Currently, it creates width.
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