A demo of the current work (2018/01/22) done by the Igalia Web Platform Team to make frame scrollable on iOS. Work sponsored by the AMP project.
Test page: people.igalia.com/fwang/ios/scrollable-iframes.html
Bugzilla entry: bugs.webkit.org/show_bug.cgi?id=149264
Previous video: player.vimeo.com/video/225557385