2.1.272 Part 1 Section 17.8.3.13, panose1 (Panose-1 Typeface Classification Number)
a. The standard states that when a font is unavailable, the panose1 element shall not be modified.
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Word does not roundtrip the panose1 value for fonts not installed on the system.
b. The standard states that when a font is unavailable the panose1 element shall not be modified.
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Word can modify the panose1 element of an unavailable font if a font with the same name has been loaded before in the same Word instance.