The computed style section should collapse multiple properties to shorthand properties when applicable. For instance: margin-bottom: 4px; margin-left: 0px; margin-right: 0px; margin-top: 0px; could be collapsed to: margin: 0px 0px 4px 0px;
This depends on bug 13658. This was working to some extent before (sans bug 13658), but I think that support was removed.
<rdar://problem/5712833>
This will break the computed style trace implemented by pfeldman@chromium.org. I will defer the decision to him.
Querying shorhands from getComputedStyle now works. Maybe it's time to revisit the problem. Pavel any thought?
Seems confusing when matching to style-tracing https://bugs.webkit.org/show_bug.cgi?id=20691
On trunk, whether shorthands are used follows the original style rules. This is because we link back to the rules inside the resource.