[Webkit-unassigned] [Bug 204271] New: UIEvents Event Detection Gives False Positives for Drag events

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204271

            Bug ID: 204271
           Summary: UIEvents Event Detection Gives False Positives for
                    Drag events
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dhtmlkitchen at gmail.com

Mozilla/5.0 (iPhone; CPU iPhone OS 12_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Mobile/15E148 Safari/604.1


https://www.w3.org/TR/uievents/#conf-interactive-ua

"A conforming browser MUST support scripting, declarative interactivity, or some other means of detecting and dispatching events in the manner described by this specification, and MUST support the APIs specified for that event type."


let div = document.createElement("div");
div.setAttribute("ondragstart", ()=>0);
console.log(typeof div.ondragstart);


Result: "function", but objects are not draggable and dragstart event doesn't fire.

Expected result: "function" and objects are draggable. Otherwise, "undefined" and objects are not draggable.

Either support html5 drag'n'drop or make it undetectable. Also the issue is with the `draggable` attribute.

The documentation is incorrect, too:— 

  NOTE
  This technology is supported with Safari 11 in both macOS and iOS.

— No, it is not supported in iOS. At least, not universally on all iOS devices and it doesn't work on iPhone.

https://developer.apple.com/library/archive/documentation/AppleApplications/Conceptual/SafariJSProgTopics/DragAndDrop.html

Scroll down to the bottom of that page, copy'n'paste the example into an html document, save it, start a web server, and access that html document  on your phone through your network (a local IP address will do). Turn on mobile debugging in safari on the mac to see the console. (Apple developers found this to be too much work, so put yet another burden onto everyone else.)

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