NEW 222632
pointercancel event not fired on drag start 
https://bugs.webkit.org/show_bug.cgi?id=222632
Summary pointercancel event not fired on drag start
Devon Govett
Reported 2021-03-02 16:07:08 PST
The pointercancel event should be fired when starting a drag on an element with `draggable="true"`. This is made explicit in the spec: https://www.w3.org/TR/pointerevents2/#the-pointercancel-event and Firefox and Chrome behave this way. Safari on macOS does not. Steps to reproduce: 1. Open https://codepen.io/devongovett/pen/MWbXYgR in Safari on macOS. 2. Mouse down on the button. Notice that it turns red due to pointerdown being fired. 3. Drag the button. Notice that it stays red due to pointercancel not being fired. 4. Open the example in Chrome and Firefox and perform the above steps. Notice that the button turns green on drag due to pointercancel being fired. The behavior also appears to be correct in Safari on iOS.
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Radar WebKit Bug Importer
Comment 1 2021-03-09 16:08:20 PST
<rdar://problem/75239775>
alexreardon
Comment 2 2024-09-15 22:07:40 PDT
I just ran into this bug too. The drag and drop spec also calls out that a "pointercancel" should come straight after a "dragstart" https://html.spec.whatwg.org/multipage/dnd.html#drag-and-drop-processing-model
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