Andreas Tolfsen 05e86fe521 Bug 1253244 - Correct x,y offset type checks and add tests; r=automatedtester
The xOffset and yOffset arguments to element.coordinates previously
checked loose falsiness.  If a number <= 0 would be given as an argument,
they would not be used and it would return the centre of the element.

This change adds more checks, documentation, and tests.

MozReview-Commit-ID: KmsiVFipzWx

--HG--
extra : rebase_source : 96e6c8c127071356fec029f5eaa4254ae60930b3
2016-03-04 15:34:28 +00:00

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