The "grid-template-areas" property is a computable area, defined in the CSSComputedStyleDeclaration class with an specific computed value. However, it's not shown by the Web Inspector in the corresponding Computed tab. It seems that the root cause of this issue is that the property is not present in the CSSComputedStyleDeclaration::staticComputableProperties.
Created attachment 226528 [details] Patch
Comment on attachment 226528 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=226528&action=review > Source/WebCore/ChangeLog:11 > + No new tests, no change on behavior. This is inexact, there is a change in behavior. Remove that line.
Created attachment 226671 [details] Patch
Comment on attachment 226671 [details] Patch Clearing flags on attachment: 226671 Committed r165613: <http://trac.webkit.org/changeset/165613>
All reviewed patches have been landed. Closing bug.