[css-grid] Allow multiple items to be flowed into a BFC in a single grid area

[tabatkins]

On Thu, Sep 15, 2016 at 2:40 AM, Michael Cohen michael.cohen@buildasign.com wrote:

Hello,
I've started working with grid layout, when assigning multiple elements to
the same grid area they layer. I understand that this is the intended use.
Has there been any consideration of a property that would allow multiple
elements assigned to the same grid area to display in a block formatting
context? I can imagine a responsive design having more grid areas in a large
desktop layout than it does a mobile layout. It might be desirable to have
multiple grid items laid out in a grid area.

[tabatkins]

Yes, this was considered early on, and was part of some of the early spec proposals. Unfortunately, it's rather complicated to do - it ends up being a subset of the Regions functionality, which the WG ended up abandoning due to implementor objection.

It's definitely something I'd still like to pursue in the future, especially since most of the problems with Regions functionality come from the "one source => multiple boxes" part, while this is "multiple sources => one box", a theoretically simpler problem. However, this is definitely not going into Grid level 1, so I've tagged it as Grid 2 to keep track of things.

[tabatkins]

#1183 is a dupe of this, but it has better examples, so I'll close this one and leave #1183 open.