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→How focus should behave in 2.0
*otherwise, the used tab index is -1 and the element is not focusable.
When the used tab index is -1, the element is not part of the tab order, but may still be focusableas defined above. When the used tab index is a non negative integer, it becomes part of the tab order.
The default implementation of the getter for the tabIndex property of the nsIDOMXULControlElement interface is:
