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

    Description: Fire dragend 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: Drag the blue image Drop it on the green box

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

If the drag operation failed or succeeded, fire a DND event named dragend at the source node.