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OpenType specification (OpenType 1.6)

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

OpenType specification version 1.6

Appendices

Updates to this specification are noted in the change log. OpenType version 1.6 is fully technically equivalent to the ISO/IEC 14496-22:2009 (Second Edition) “Open Font Format” standard. The standard was published in July 2009, and is now freely available for download from the ISO website.