2.1.1381 Part 1 Section 21.1.2.1.3, normAutofit (Normal AutoFit)
1. The standard states that if the normAutofit element is omitted then no autofit or autofit off is implied.
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PowerPoint follows normAutofit as described above, however other Office apps like Word or Excel do not follow this and instead use a hierarchy of text styles to determine if the text should be autofit or not.