Force Touch events
Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.
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
webkitmouseforcewillbeginNon-standardThis event is fired before the
mousedownevent. Its main use is that it can bedefault-prevented.webkitmouseforcedownNon-standardThis event is fired after the
mousedownevent as soon as sufficient pressure has been applied for it to qualify as a "force click".webkitmouseforceupNon-standardThis event is fired after the
webkitmouseforcedownevent as soon as the pressure has been reduced sufficiently to end the "force click".webkitmouseforcechangedNon-standardThis 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 thewebkitmouseforcewillbegin,mousedown,webkitmouseforcechanged,webkitmouseforcedown,webkitmouseforceup,mousemove, andmouseup event objects:
MouseEvent.webkitForceNon-standardRead onlyThe amount of pressure currently being applied to the trackpad/touchscreen.
Constants
These constants are useful for determining the relative intensity of the pressure indicated byMouseEvent.webkitForce:
MouseEvent.WEBKIT_FORCE_AT_MOUSE_DOWNNon-standardRead onlyMinimum force necessary for a normal click.
MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWNNon-standardRead onlyMinimum force necessary for a force click.
Specifications
Not part of any specification. Apple hasa description at the Mac Developer Library.