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Changes between Initial Version and Version 1 of Ticket #10151, comment 6

initial	v1
1	1	This is actually working properly. In the first fiddle, you're using `{my: 'left top+15'}` which means that the default position (center) should be used for `at`. In the last fiddle, you're using `{}` which means both `my` and `at` should use the center.
2	2
3		The reason that the initial setting and the subsequent settings behave differently is because initialization always does a merge of the defaults and the provided options, which subsequent settings always do a full set.
	3	The reason that the initial setting and the subsequent settings behave differently is because initialization always does a merge of the defaults and the provided options, while subsequent settings always do a full set.