What will be the problem if hhea values does not match with sTypo and usWin table data?

How user will be impacted if hhea values does not match with sTypo and usWin table data?

You might get different line spacing in different environments/apps.

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For cross-platform consistency, it should match sTypo and the Use Typo Metrics bit should be on. See the Vertical Metrics tutorial for details.

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