2.1.1283 Part 1 Section 20.1.7.6, xfrm (2D Transform for Individual Objects)
a. The standard states that the rot attribute specifies the rotation of a graphic frame.
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In Office, rot specifies the clockwise rotation of a shape.
b. The standard allows attributes flipH, flipV and rot to be applied to a graphicFrame.
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In Office, attributes FlipH, flipV and rot are ignored when applied to a graphicFrame.