Force Touch on Safari

[Iraka-C]

The force of a touch is different from pointerevent.pressure.
Complete the support for 3D Force Touch

[Iraka-C]

Another

Click-While-Moving causes a strange head at the top of the line
(Safari force touch enabled)

[Iraka-C]

Partially solved by adding webkitmouseforcewillbegin webkitmouseforcechanged events to detect force touch process.

There's still a larger heading, which can be seen when turn smoothness to 0.