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.