[Webkit-unassigned] [Bug 106071] New: Existence of window.Touch can break websites mobile device detection

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106071

           Summary: Existence of window.Touch can break websites mobile
                    device detection
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: WebExposed
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rbyers at chromium.org
                CC: abarth at webkit.org


In bug 96295, I added window.Touch and window.TouchList constructors when built with TOUCH_EVENTS.  At least one web app uses the existance of window.Touch to infer that they're on a mobile default (and so shouldn't listen to mouse events).  This is completely broken and we need to get such sites fixed, but our strategy should be the same as for more common (but equally wrong) check sites do like looking for window.ontouchstart (which, for now, we enable dynamically at runtime - eg. based on whether or not a touch screen is actually present)

For now (Chrome M25) I'm going to revert my change.  I'll file a separate bug to put these back but controlled dynamically.

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