Per section 6.1 "grid-row-span and grid-column-span", we should support grid areas spanning more than one row / column. This also covers the extended syntax of grid-{row|column}-position with 2 values.
Repurposing the bug as the syntax has changed dramatically in the specification.
Julien are you ok with repurposing this bug to something like https://codereview.chromium.org/13992003/? I can port it since we need to add that support to WebKit too.
Closing this now as there is nothing else to do.