fullscreen iframe should not be flattened becouse its not scrollable. Working on patch, will be proposed soon.
Created attachment 220735 [details] Patch
from efl-wk2: make[2]: *** [Source/WebCore/CMakeFiles/WebCore.dir/loader/HistoryController.cpp.o] Error 4 this file is not related to patch proposed.
Comment on attachment 220735 [details] Patch Already fullscreen is scrollable. Issue appears on html5video.org after entering fullscreen but looks like this is rather web page code issue.