    Description: Fire dragstart 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: Click and drag the red box

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

If it is an element that is being dragged, then set the drag data store elements list to contain just the source node. Fire a DND event named dragstart at the source node.