Created attachment 196471 [details]
Test with html5:dialog and css-regions enabled.
Steps to reproduce:
1. Create a named flow using '-webkit-flow-into:' and '-webkit-flow-from:'.
2. Add a dialog element to the region chain using '-webkit-flow-from'.
3. Notice that the flowed content ignores the dialog element.
Tested on Chrome Canary.
Closing as RESOLVED/INVALID as the <dialog> bits have been removed from WebKit since the Blink split.