You know that trick in Google Chrome and Maps that allows you zoom seamlessly with one finger? That would be with a double tap, hold then drag? That same trick works in Gmail on devices running Kit Kat. My Nexus 5 is currently allowing me to perform the trick, as is my Moto X on Android 4.4. However, the same experience can’t be had on my Moto X running Android 4.2.2.