OpenType 1.9 errata

This page documents errors in the OpenType specification that have technical significance and could lead to incorrect implementations. The scope is limited to issues in which the OpenType 1.9 specification as originally published implies technical details that are contrary to the intended design. Corrections may include corrections to incorrect values related to certain table fields, incorrect formulas for computing certain values, or similar issues. Corrections will not include any changes to data structures. If the textual change required for the correction is minor, the correction will be made in the specification and also listed here. If larger textual changes are required, the issue may be described here, but actual changes may be left to a future version. In either case, the status will be indicated in the table below.

Certain minor, editorial errors such as mis-spelling of words with no technical impact may on occasion be corrected silently, without notice or version update.

Date Page Description Status
26 January 2022 meta — Metadata Table The URL provided for BCP 47 was incorrect. Corrected in 1.9 (2022-1-26)
26 January 2022 cmap — Character to Glyph Index Mapping Table In OpenType 1.8.4, a technical error was introduced into the description of the entrySelector field of the format 4 subtable while revising the description of this field and of a similar field in the font Table Directory. For entrySelector in the 'cmap' format 4 subtable, “numTables” should be “segCount”. Corrected in 1.9 (2022-1-26)