2.1.1306 Part 1 Section 20.1.8.53, softEdge (Soft Edge Effect)

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a.   The standard states that the softEdge element specifies a soft edge effect where the edges of the shape are blurred while the fill is not affected.

In Office, this element specifies an inset radius for blur.  Only the area between the shape boundary and the inset specified by the rad attribute is affected.