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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Force Touch events are a proprietary, Apple-specific feature which makes possible (where supported by the input hardware) new interactions based on how hard the user clicks or presses down on the touchscreen or trackpad.
Events
webkitmouseforcewillbegin- This event is fired before the
mousedownevent. Its main use is that it can beEvent.preventDefault()ed. webkitmouseforcedown- This event is fired after the
mousedownevent as soon as sufficient pressure has been applied for it to qualify as a "force click". webkitmouseforceup- This event is fired after the
webkitmouseforcedownevent as soon as the pressure has been reduced sufficiently to end the "force click". webkitmouseforcechanged- This event is fired each time the amount of pressure changes. This event first fires after the
mousedownevent and stops firing before themouseupevent.
Event properties
The following property is known to be available on the webkitmouseforcewillbegin, mousedown, webkitmouseforcechanged, webkitmouseforcedown, webkitmouseforceup, mousemove, and mouseup event objects:
MouseEvent.webkitForceRead only- The amount of pressure currently being applied to the trackpad/touchscreen
Constants
These constants are useful for determining the relative intensity of the pressure indicated by MouseEvent.webkitForce:
MouseEvent.WEBKIT_FORCE_AT_MOUSE_DOWNRead only- Minimum force necessary for a normal click
MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWNRead only- Minimum force necessary for a force click
Specifications
Not part of any specification. Apple has a description at the Mac Developer Library.