HTML5 Drag and Drop: Fire dragleave event during the drag and drop processing

    Description: Fire dragleave event during the drag and drop processing

Test Result | Test Assertion
Manual | Test passes if if the word "PASS" appears to the left after following the steps below. Steps: Select the text inside the red box Drag it over the blue box and drop it on the green box

http://dev.w3.org/html5/spec/dnd.html#drag-and-drop-processing-model

If there is a change in the current target element, and if the previous target element was not null or a part of a non-DOM document, then fire a DND event named dragleave at the previous target element.

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