    Description: Fire dragenter 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 and enter the green box

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

If the user is indicating a different immediate user selection than during the last iteration (or if this is the first iteration), and if this immediate user selection is not the same as the current target element, then update the current target element as follows: - If the new immediate user selection is null, Set the current target element to null also. - If the new immediate user selection is in a non-DOM document or application, Set the current target element to the immediate user selection. - Otherwise, Fire a DND event named dragenter at the immediate user selection.

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