Upstreaming http://code.google.com/p/chromium/issues/detail?id=116229 (second issue). Patch to follow.
Created attachment 130088 [details] Patch
Committed r109732: <http://trac.webkit.org/changeset/109732>
This code looks like it would not handle duplicate classes very well. So: <div class="foo foo foo"></div> Might produce: div.foo.foo.foo Maybe some of the code inside of WebInspector.DOMPresentationUtils.decorateNodeLabel should be shared. That does eliminate duplicates.