CustomTabs branch is most recent and preferred Android implementation at the moment.
Current Master branch is for Android Development. Please create new branch or repo for the iOS webDev.
There are some open Issues to determine best approach for Mobile Dev. Please, feel free to create Tasks for anything you may find necessary and please add the tag 'backlog' to your post) or 'Sprint' if urgent. Tasks: https://publichappinessmovement.com/c/web-developers/web-dev-apps/l/latest?board=default