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The '.' denotes whitespace in the template layout module's template definition syntax but isn't mentioned in the grid layout spec. It probably makes sense to add this to the grid-template property. Also the '@' denotes a default slot in the template layout module's template definition but isn't mentioned in the grid layout spec. The '@' may not belong in the grid spec as the grid doesn't flow its content into a slot, elements layer instead. Rather than adding '@' it may make sense to just use the auto-placement feature instead.
Bulk assigning bugs to pcupp@microsoft.com.
Done - the "." indicates an unnamed cell in the template. We're not using @, as we don't have anything that uses the notion of a default slot any more.