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.

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.