Created attachment 168521 [details]
Reduction which can show failure of dynamic reprojection.
If a host has shadowRoot A with a nested shadowRoot B that includes an insertion point in its light dom, if elements are added to the host dynamically, these elements are not projected as expected into B. It's unclear if they are projecting at all as they do not render.
I'll take a look
Created attachment 169166 [details]
Comment on attachment 169166 [details]
Clearing flags on attachment: 169166
Committed r131615: <http://trac.webkit.org/changeset/131615>
All reviewed patches have been landed. Closing bug.