twitter/bootstrap — pull request #4200 by ericmatthys (2012-07-27 15:45:22+00:00)
Title: Uses data-tooltip-position to handle tooltips related to fixed elements

Tooltips associated with fixed elements must account for scroll position. If the tooltip-position is set to fixed, adjust the position of the tooltip and add a "tooltip-fixed" class to the tooltip, which adds a position: fixed style.

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