2.1.1382 Part 1 Section 21.1.2.1.4, spAutoFit (Shape AutoFit)
a. The standard states that if the spAutoFit element is omitted then noAutofit or auto-fit off is implied.
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Office does not follow this and instead uses a hierarchy of text styles to determine if the text should be autofit or not.
b. The standard states that the spAutofit element specifies that text within a shape is scaled in order to contain all the text inside the bounds of the shape.
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Office uses the spAutoFit element to specify that the containing shape should be resized to contain text.