The selectors for pseudo-elements do not appear in the Visual styles panel. Instead, an error is produced and the "Style Rules" section appears empty.
<rdar://problem/22349203>
Created attachment 259397 [details] Patch
Comment on attachment 259397 [details] Patch Clearing flags on attachment: 259397 Committed r188682: <http://trac.webkit.org/changeset/188682>
All reviewed patches have been landed. Closing bug.