otf-features.md

OpenType features

The OpenType specification defines the following "feature" tags.

• aalt Access All Alternates
• abvf Above-base Forms
• abvm Above-base Mark Positioning
• abvs Above-base Substitutions
• afrc Alternative Fractions
• akhn Akhands
• blwf Below-base Forms
• blwm Below-base Mark Positioning
• blws Below-base Substitutions
• calt Contextual Alternates
• case Case-Sensitive Forms
• ccmp Glyph Composition / Decomposition
• cfar Conjunct Form After Ro
• cjct Conjunct Forms
• clig Contextual Ligatures
• cpct Centered CJK Punctuation
• cpsp Capital Spacing
• cswh Contextual Swash
• curs Cursive Positioning
• cv01-cv99 Character Variants
• c2pc Petite Capitals From Capitals
• c2sc Small Capitals From Capitals
• dist Distances
• dlig Discretionary Ligatures
• dtls Dotless forms
• dnom Denominators
• expt Expert Forms
• falt Final Glyph on Line Alternates
• fin2 Terminal Forms #2
• fin3 Terminal Forms #3
• fina Terminal Forms
• flac Flattened Ascent Forms
• frac Fractions
• fwid Full Widths
• half Half Forms
• haln Halant Forms
• halt Alternate Half Widths
• hist Historical Forms
• hkna Horizontal Kana Alternates
• hlig Historical Ligatures
• hngl Hangul
• hojo Hojo Kanji Forms (JIS X 0212-1990 Kanji Forms)
• hwid Half Widths
• init Initial Forms
• isol Isolated Forms
• ital Italics
• jalt Justification Alternates
• jp78 JIS78 Forms
• jp83 JIS83 Forms
• jp90 JIS90 Forms
• jp04 JIS2004 Forms
• kern Kerning
• lfbd Left Bounds
• liga Standard Ligatures
• ljmo Leading Jamo Forms
• lnum Lining Figures
• locl Localized Forms
• ltra Left-to-right alternates
• ltrm Left-to-right mirrored forms
• mark Mark Positioning
• med2 Medial Forms #2
• medi Medial Forms
• mgrk Mathematical Greek
• mkmk Mark to Mark Positioning
• mset Mark Positioning via Substitution
• nalt Alternate Annotation Forms
• nlck NLC Kanji Forms
• nukt Nukta Forms
• numr Numerators
• onum Oldstyle Figures
• opbd Optical Bounds
• ordn Ordinals
• ornm Ornaments
• palt Proportional Alternate Widths
• pcap Petite Capitals
• pkna Proportional Kana
• pnum Proportional Figures
• pref Pre-Base Forms
• pres Pre-base Substitutions
• pstf Post-base Forms
• psts Post-base Substitutions
• pwid Proportional Widths
• qwid Quarter Widths
• rand Randomize
• rclt Required Contextual Alternates
• rkrf Rakar Forms
• rlig Required Ligatures
• rphf Reph Forms
• rtbd Right Bounds
• rtla Right-to-left alternates
• rtlm Right-to-left mirrored forms
• ruby Ruby Notation Forms
• salt Stylistic Alternates
• sinf Scientific Inferiors
• size Optical size
• smcp Small Capitals
• smpl Simplified Forms
• ss01 Stylistic Set 1
• ss02 Stylistic Set 2
• ss03 Stylistic Set 3
• ss04 Stylistic Set 4
• ss05 Stylistic Set 5
• ss06 Stylistic Set 6
• ss07 Stylistic Set 7
• ss08 Stylistic Set 8
• ss09 Stylistic Set 9
• ss10 Stylistic Set 10
• ss11 Stylistic Set 11
• ss12 Stylistic Set 12
• ss13 Stylistic Set 13
• ss14 Stylistic Set 14
• ss15 Stylistic Set 15
• ss16 Stylistic Set 16
• ss17 Stylistic Set 17
• ss18 Stylistic Set 18
• ss19 Stylistic Set 19
• ss20 Stylistic Set 20
• ssty Math Script Style Alternates
• stch Stretching Glyph Decomposition
• subs Subscript
• sups Superscript
• swsh Swash
• titl Titling
• tjmo Trailing Jamo Forms
• tnam Traditional Name Forms
• tnum Tabular Figures
• trad Traditional Forms
• twid Third Widths
• unic Unicase
• valt Alternate Vertical Metrics
• vatu Vattu Variants
• vert Vertical Writing
• vhal Alternate Vertical Half Metrics
• vjmo Vowel Jamo Forms
• vkna Vertical Kana Alternates
• vkrn Vertical Kerning
• vpal Proportional Alternate Vertical Metrics
• vrt2 Vertical Alternates and Rotation
• zero Slashed Zero

In addition, there are (currently) nine deprecated feature tags which might still be encountered in the wild from time to time:

• altv Alternate Vertical Metrics, deprecated
• crcy Currency, deprecated
• dflt Default Processing, deprecated
• jajp Japanese Forms, deprecated
• jp03 JIS03 Forms, deprecated
• kokr Korean Forms, deprecated
• vivn Vietnamese Forms, deprecated
• zhcn Simplified Chinese Forms, deprecated
• zntw Traditional Chinese Forms, deprecated