The features listed below are sorted in alphabetical order by tag name. Click on the feature tag to view feature description and implementation, or go to the feature descriptions page.
| Feature tag | Friendly name |
|---|---|
| 'aalt' | Access All Alternates |
| 'abvf' | Above-base Forms |
| 'abvm' | Above-base Mark Positioning |
| 'abvs' | Above-base Substitutions |
| 'afrc' | Alternative Fractions |
| 'akhn' | Akhand |
| 'apkn' | Kerning for Alternate Proportional Widths |
| '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 |
| 'chws' | Contextual Half-width Spacing |
| 'cjct' | Conjunct Forms |
| 'clig' | Contextual Ligatures |
| 'cpct' | Centered CJK Punctuation |
| 'cpsp' | Capital Spacing |
| 'cswh' | Contextual Swash |
| 'curs' | Cursive Positioning |
| 'cv01' – 'cv99' | Character Variant 1 – Character Variant 99 |
| 'c2pc' | Petite Capitals From Capitals |
| 'c2sc' | Small Capitals From Capitals |
| 'dist' | Distances |
| 'dlig' | Discretionary Ligatures |
| 'dnom' | Denominators |
| 'dtls' | Dotless Forms |
| 'expt' | Expert Forms |
| 'falt' | Final Glyph on Line Alternates |
| 'fin2' | Terminal Forms #2 |
| 'fin3' | Terminal Forms #3 |
| 'fina' | Terminal Forms |
| 'flac' | Flattened Accent 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 Form |
| 'rtbd' | Right Bounds |
| 'rtla' | Right-to-left Alternates |
| 'rtlm' | Right-to-left Mirrored Forms |
| 'ruby' | Ruby Notation Forms |
| 'rvrn' | Required Variation Alternates |
| 'salt' | Stylistic Alternates |
| 'sinf' | Scientific Inferiors |
| 'size' | Optical size |
| 'smcp' | Small Capitals |
| 'smpl' | Simplified Forms |
| 'ss01' – 'ss20' | Stylistic Set 1 – 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 |
| 'vapk' | Kerning for Alternate Proportional Vertical Metrics |
| 'vatu' | Vattu Variants |
| 'vchw' | Vertical Contextual Half-width Spacing |
| 'vert' | Vertical Alternates |
| '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 |
| 'vrtr' | Vertical Alternates for Rotation |
| 'zero' | Slashed Zero |