In bug 135945, some FIXME comments were added for touch events and XSLT. The latter was fixed in 149827, I'm opening this one for the former.
The FIXME comments can be found at https://trac.webkit.org/changeset/224330/
Created attachment 325757 [details] WIP Patch Tentative patch. Obviously, it's not really possible to work on this without access to the internal SDK. The build fails at Source/WebCore/platform/ios/PlatformEventFactoryIOS.mm
<rdar://problem/46311566>