In bug 118051 we added support for the 'span' keyword at parser level. This change effectively uses it to perform the final layout of the grid items. This has been already implemented in Blink.
We should probably merge:
Properly handle 'span' position during layout
This change plumbs the final bits so that we now recognize 'span'
positions and resolve them accordingly.
Created attachment 209864 [details]
Created attachment 209894 [details]
Committed r154753: <http://trac.webkit.org/changeset/154753>
*** Bug 115404 has been marked as a duplicate of this bug. ***