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OpenType specification (OpenType 1.8.1)

The OpenType™ specification has been formatted in HTML, but may link to .PDF files.

OpenType specification version 1.8.1

Errata

Appendices

OpenType 1.8.1 incorporates revisions in Amendment 1 and Draft Amendment 2 of the ISO/IEC 14496-22:2015 “Open Font Format (3rd edition)” standard. Additionally, it incorporates extensions not included in ISO/IEC 14496-22:2015 plus Amendments 1 and 2: the 'MERG', 'meta' and 'sbix' tables, and all of the addtions related to OpenType Font Variations. Current editions and amendments of ISO/IEC 14496-22 are freely available for download from the ISO website.

Updates to this specification are noted in the change log.