This was an oversight in the checkin for bug 1461284. tfoot was duplicated due to a copy and paste error, thead was not mapped at all. It is now properly mapped, and the test adjusted accordingly.
Bug 1568728 Comment 1 Edit History
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This was an oversight in the checkin for bug 1461244. tfoot was duplicated due to a copy and paste error, thead was not mapped at all. It is now properly mapped, and the test adjusted accordingly.