[Webkit-unassigned] [Bug 206216] New: PointerEvent has 0 as pressure when the input device is not pressure-sensitive

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206216

            Bug ID: 206216
           Summary: PointerEvent has 0 as pressure when the input device
                    is not pressure-sensitive
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekomanma at pixiv.com

W3C's pointer events level 2 specification states:
> For hardware and platforms that do not support pressure, the value MUST be 0.5 when in the active buttons state and 0 otherwise.
https://www.w3.org/TR/2019/REC-pointerevents2-20190404/

However, WebKit sets 0 as pressure in such case. The behavior is confirmed with:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.4 Safari/605.1.15

Apparently, WebKit refers to pressure property of NSEvent. The documentation states:
> For input devices that aren’t pressure-sensitive, the value is either 0.0 or 1.0.
https://developer.apple.com/documentation/appkit/nsevent/1534543-pressure

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