[css-break-3] Add the concept of grouping boxes #12805
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This improves layout in tables and grid containers which contain cells that span across multiple rows which may be broken into separate fragmentainers.
Here is an example of what behavior this aims to improve:

This is not meant to be a requirement for UAs, but rather just a suggestion. I hope the use of "should" instead of "must" has that power. (if not, that can be changed)
More context: #12801
If this gets approved, I'd be happy to sign the IPR thingy.