The inline-grid value is not yet supported for the display property, and so we should not yet be testing it. In the testcase, the display property value is falling back to block, and displaying incorrectly.
Created attachment 199092 [details] initial patch
Comment on attachment 199092 [details] initial patch r=me
Comment on attachment 199092 [details] initial patch Clearing flags on attachment: 199092 Committed r148915: <http://trac.webkit.org/changeset/148915>
All reviewed patches have been landed. Closing bug.