The grid-row, grid-column and grid-area shorthands must use slash instead of whitespace as separator.
Fixing this bug would require to merge http://crrev.com/1132753002 patch.
Created attachment 262632 [details]
Comment on attachment 262632 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=262632&action=review
> +-webkit-grid-area [Longhands=-webkit-grid-row-start|-webkit-grid-column-start|-webkit-grid-row-end|-webkit-grid-column-end]
Wow this is bad. This means that we're expanding incorrectly the shorthand and that we have no tests to verify that. Please use a different bug to upload this change with its corresponding test.
I think this is causing failures on the WPT test https://wpt.live/css/css-grid/parsing/grid-area-valid.html