Hello,
I've no idea if this is useful, but with Collapsed Topics I've discovered that in M3.1 YUI 'Y.delgate' will fail to work in terms of running the passed function unless the container within the delegated DOM node contains a link ('a' tag) on Safari on iPhone's / iPad's. It might be that this has always been the case? But I've implemented MDL-51802 for CT and discovered this.
Cheers,
Gareth