The QuickType feature in the Keyboards subsystem in Apple iOS before 8.1 collects typing-prediction data from fields with an off autocomplete attribute, which makes it easier for attackers to discover credentials by reading credential values within unintended DOM input elements.
https://support.apple.com/kb/HT6541
https://exchange.xforce.ibmcloud.com/vulnerabilities/97666
http://www.securitytracker.com/id/1031077