This is a follow-up fix for r116739. The audit panel uses span as a container for formatted results, including those produced by node formatter. ElementsTreeOutline needs offsetWidth in treeElementFromEvent(), which is only meaningful for block-level elements (returns 0 for inline).
Created attachment 141358 [details] Patch
Comment on attachment 141358 [details] Patch We should consider making ElementsTreeOutline element a div.
Committed r116743: <http://trac.webkit.org/changeset/116743>