The tree below shows some basic drag-n-drop and copy-n-paste scenarios and marks the result as OK or ERR (or both where the result should be corrected).

- The results were gathered on three platforms: WINDOWS, OSX and LINUX.
- The data types: PLAIN TEXT, HTML and IMAGE.
- For HTML an editable page was taken here: http://xing.github.io/wysihtml5

PLAIN TEXT
    WINDOWS
        DnD
            inside WebView
                OK
            from WebView to outside
                ERR: the drop is represented as an image
            to WebView from outside
                OK
        CnP
            inside WebView
                OK
            from WebView to outside
                OK
            to WebView from outside
                OK

    OSX
        DnD
            inside WebView
                OK
            from WebView to outside
                OK
            to WebView from outside
                OK
        CnP
            same as DnD

    LINUX
        DnD
            inside WebView
                OK
            from WebView to outside
                OK
            to WebView from outside
                OK
        CnP
            same as DnD

HTML
    WINDOWS
        DnD
            inside WebView
                OK
            from WebView to outside
                OK: the drop looks ok
                ERR: the drop is an image
            to WebView from outside
                OK
        CnP
            inside WebView
                OK
            from WebView to outside
                OK
            to WebView from outside
                OK

    OSX
        DnD
            inside WebView
                OK
            from WebView to outside
                OK: the drop is formatted properly
                ERR: links are surrounded with extra symbols
            to WebView from outside
                OK: the drop preserves the text data
                ERR: the drop is a plain text
        CnP
            same as DnD

    LINUX
        DnD
            inside WebView
                OK
            from WebView to outside
                ERR: the drop is of wrong encoding
            to WebView from outside
                OK: the drop preserves the text data
                ERR: the drop is a plain text
        CnP
            inside WebView
                OK
            from WebView to outside
                OK: the drop preserves the text data
                ERR: the drop is a plain text
            to WebView from outside
                ERR: the drop is a garbage plain text

IMAGE
    WINDOWS
        DnD
            from WebView to outside
                OK
        CnP
            from WebView to outside
                ERR: the drop is empty
     
    OSX
        DnD
            from WebView to outside
                ERR: IllegalArgumentException on drag start, no drop
        CnP
            from WebView to outside
                OK

    LINUX
        DnD
            from WebView to outside
                ERR: the drop is empty
        CnP
            from WebView to outside
                OK

Also, the testing was performed with the fix for RT-40330 applied. (Which doesn't degrade the behavior, but improves it in some cases).