[css-flexbox-1] Collapsed items under-tested

[svgeesus]

4.4. Collapsed Items is looking rather under-tested: only two tests and firefox the only browser with passes.

Is this a corner case no-one cares about? Or is the spec unclear?

[svgeesus]

Same story in Collapse visibility:collapse items. with four tests, only firefox passes any.

[svgeesus]

Also the Ideal Algorithm has the caveat

Considering only non-collapsed flex items;