After subscribing to "pointermove" events, I noticed that I am receiving events with undefined values for the movementX and movementY properties. I have tested this on both Chrome and Safari, but have not found any documentation regarding this issue in OS compatibility charts. Does this mean that the properties are not supported on these browsers?
Note: I have tried testing with and without the touch-action: none attribute.
MDN flags the properties movementX and movementY as having limited availability due to Safari on iOS/iPadOS not supporting them (whether it's a bug or a missing feature remains unclear.) Despite a bug report being marked as "RESOLVED FIXED," the issue still persists, requiring manual calculation of the delta.
All browsers exhibit this behavior because they utilize WebKit as their engine as mandated by Apple for any browser on the App Store.
One simple method to address this issue is as follows:
// declare variables outside the event handlers
let position
let movement
// update position in the pointer down event handler
position = [event.x, event.y]
// calculate movement in the pointer move event handler
movement = [event.x - position[0], event.y - position[1]]
position = [event.x, event.y]
// now make use of the 'movement' values...
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