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| *.sfd linguist-detectable=true | ||
| *.fea linguist-detectable=true linguist-language=fontforge |
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| # Name or Organization <email address> | ||
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| Caleb Maclennan <[email protected]> | ||
| Christoph Päper <[email protected]> | ||
| Dario Gjorgjevski <[email protected]> | ||
| Felix Kopecky <[email protected]> | ||
| Gyuris Gellért <[email protected]> | ||
| Héctor M. Monacci <[email protected]> | ||
| Ivo Straka <[email protected]> | ||
| jco <[email protected]> | ||
| Jonathan Washington <[email protected]> | ||
| Khaled Hosny <[email protected]> | ||
| Mark E. Shoulson <[email protected]> | ||
| Maurizio M. Gavioli <[email protected]> | ||
| Nicolas Semrau <[email protected]> | ||
| Philipp H. Poll <[email protected]> | ||
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| # Name <email address> | ||
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| Caleb Maclennan <[email protected]> | ||
| Christoph Päper <[email protected]> | ||
| Dario Gjorgjevski <[email protected]> | ||
| Felix Kopecky <[email protected]> | ||
| Gyuris Gellért <[email protected]> | ||
| Ivo Straka <[email protected]> | ||
| jco <[email protected]> | ||
| Jonathan Washington <[email protected]> | ||
| Khaled Hosny <[email protected]> | ||
| Mark E. Shoulson <[email protected]> | ||
| Maurizio M. Gavioli <[email protected]> | ||
| Nicolas Semrau <[email protected]> | ||
| Philipp H. Poll <[email protected]> | ||
|
|
||
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| # Standard OpenType Font Features | ||
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| Libertinus supports several OpenType features. | ||
| Some are enabled by default (`-`) others have to be opted in (`+`). | ||
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| - Small Caps: `+smcp` and `+c2sc` | ||
| - Ligatures and Contextual Alternates: `-liga`, `+hlig`, `+dlig`; `-calt` | ||
| - Kerning: `-kern` | ||
| - Capital Spacing: `+cpsp`, `case` | ||
| - Slashed zero: `+zero` | ||
| - Numerals: `-tnum`, `+pnum`, `-lnum`, `+onum`, `+pnum+onum` | ||
| - Vulgar fractions: `+frac` | ||
| - Subscripts and Superscripts: `+sinf`, `+sups` | ||
| - Diacritic marks: `-mark`, `-mkmk` | ||
| - Stylistic alternates: `+salt` | ||
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| Most of these can be accessed by high-level CSS properties or values | ||
| and by GUI controls in DTP software. | ||
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| ## Cased forms: `+case` | ||
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| All digits and some punctuation characters (i.e. parentheses, guillemets and hyphen) | ||
| use shapes that better fit with all-uppercase text (`.cap` or `.sc`). | ||
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| ## Standard ligatures: `-liga` | ||
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| In serif faces, | ||
| the Latin lowercase letter sequences *ſſ*, *ſſi*, *ſſj*, *ſſk*, *ſſl*, *ſh*, *ſi*, *ſj*, *ſl*, *ſs*, *ſt*, *ff*, *ffh*, *ffi*, *ffj*, *ffk*, *ffl*, *fh*, *fi*, *fj*, *fk*, *fl*, *ft* | ||
| form default ligatures. | ||
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| In sans-serif faces, | ||
| only the Latin lowercase letter sequences *ff* (also if the second one has a shortened head) and *ft* | ||
| form default ligatures. | ||
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| The related feature `clig` is not used. | ||
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| The respective CSS property is `font-variant-ligatures` with the value `common-ligatures` (or `no-common-ligatures`). | ||
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| ## Discretionary and Historical Ligatures: `+dlig`, `+hlig` | ||
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| The only historical ligatures supported are Latin lowercase *st* and *ct* in all faces. | ||
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| In all faces, | ||
| Latin lowercase letter sequences *tt* and *tz* | ||
| form discretionary ligatures. | ||
| Only in serif faces (i.e. non-sans-serif), | ||
| Latin letter sequences *Th*, *ck* and *ch* | ||
| also form discretionary ligatures. | ||
| These can all be manually forced by using ZWJ (U+200D) between letters when just the default feature `liga` is active. | ||
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| The respective CSS property is `font-variant-ligatures` with the values `discretionary-ligatures` and `historical-ligatures`. | ||
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| ## Contextual alternates: `-calt` | ||
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| In all faces, | ||
| the Latin capital and small-capital letter *Q* gains a long tail if followed by either lowercase or small-capital letter *u* or *v*. | ||
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| The Latin lowercase letter *f*, even when part of the ligature *ff*, has a shortened head | ||
| if followed by closing parentheses, top quotation mark, lowercase letter with ascending left leg, lowercase letter with diacritic mark above or uppercase letter not starting with a leg or stem on the left. | ||
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| The related feature `clig` is not used. | ||
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| The respective CSS property is `font-variant-ligatures` with the value `contextual` (or `no-contextual`). | ||
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| ## Localized alternates: `locl` | ||
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| For Serbian and Macedonian, | ||
| in all faces, | ||
| the Cyrillic lowercase letter be *б* | ||
| and in italic faces, | ||
| the Cyrillic lowercase letters ghe *г*, gje *ѓ*, de *д*, pe *п* and te *т* | ||
| are replaced by alternate glyphs. | ||
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| For Scandinavian languages, because of preferences in Sami typography, | ||
| the Latin uppercase letter Eng *Ŋ* uses a alternative glyph, cf. `ss07`. | ||
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| For Turkic languages, | ||
| ligatures where the Latin lowercase letter *i* is the second part are deactivated, | ||
| i.e. *fi*, *ffi*, *ſi* and *ſſi*. | ||
| The small-capitals handling of *i* / *ı* does not depend on `locl`, but is part of `smcp` (and `c2sc`). | ||
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| ## Numerals: `-tnum`, `+pnum`, `-lnum`, `+onum`, `+pnum+onum` | ||
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| Except for Libertinus Math, | ||
| the standard digits can be forced to *old-style* forms (with ascenders and descenders) with `onum` (`.taboldstyle`), | ||
| to default *lining* forms with `lnum`, | ||
| to *proportional* forms with `pnum` (`.fitted`), | ||
| to *tabular* (fixed-width) forms with `tnum`. | ||
| The latter two also apply to Euro *€* and Yen *¥* currency symbols and trump the other features. | ||
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| The respective CSS property is `font-variant-numeric` with the values `oldstyle-nums`, `lining-nums`, `proportional-nums` and `tabular-nums`, respectively. | ||
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| ## Vulgar fractions: `+frac`; `subs`, `sups`; `sinf` | ||
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| The same sets of inferior/subscript and superior/superscript glyphs are used for various features. | ||
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| The respective CSS property for `frac` is `font-variant-numeric` with the value `diagonal-fractions`. The value `stacked-fraction` is not supported. | ||
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| # Custom OpenType Font Features: Stylistic Sets | ||
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| ## Stylistic alternates: `+salt` | ||
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| For non-sans-serif faces, | ||
| Latin uppercase letters *J*, *K*, *R* and *W* use alternate glyphs (`.alt`). | ||
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| For small-caps faces, | ||
| Latin lowercase letters *a*, *q*, *ŋ* and *ß* use alternate glyphs (`.scalt` etc.). | ||
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| In all faces, | ||
| Latin uppercase letters *Q*, eng *Ŋ* and eszet *ẞ*, Latin lowercase letters *h*, *y* and Eszet *ß*, | ||
| Greek lowercase letters Beta *β*, Theta *θ*, Kappa *κ* and Phi *φ*, | ||
| Cyrillic lowercase letter Be *б* | ||
| and the ampersand *&* use alternate glyphs, cf. `calt`, `ss03`, `ss04`, `ss06`, `ss07`, `locl`. | ||
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| The respective CSS property is `font-variant-alternates` with the value `stylistic(<feature-value-name>)`. | ||
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| ## Stylistic Set 1 `ss01` *Low diaeresis on ‘A’, ‘E’, ‘O’* | ||
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| Intended for German, the umlaut dots above the Latin capital letters *A* and *O* (*Ä*, *Ö*) are moved further apart while the ones above *U* (*Ü*) are put closer together. | ||
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| ## Stylistic Set 2 `ss02` *Swashy ‘J’ ‘K’ ‘R’* | ||
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| A bit more swashy, cursive look with elongated tails for Latin uppercase letter *K* and *R* and a left-hand horizontal top for *J*. | ||
| This does not apply to sans-serif faces. | ||
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| ## Stylistic Set 3 `ss03` *‘double s’ to two ‘s’* | ||
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| All variants of German eszett (lowercase *ß*, uppercase *ẞ* and small-capital) are rendered as round-s digraphs *SS/ss* instead, very applicable to Swiss German texts. | ||
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| ## Stylistic Set 4 `ss04` *Upper case ‘double s’ to two ‘S’* | ||
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| Only the uppercase German eszett *ẞ* is rendered as a round-s digraph *SS*; subset of `ss03`. | ||
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| ## Stylistic Set 5 `ss05` *Crossed ‘W’* | ||
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| Latin uppercase letter *W* is rendered as a ligature of two *V*, i.e. the middle verticals are longer, as used in the Wikipedia logo. | ||
| This does not apply to sans-serif faces. | ||
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| ## Stylistic Set 6 `ss06` *Swash ‘&’* | ||
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| The ampersand *&* is rendered as an *et* ligature. | ||
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| ## Stylistic Set 7 `ss07` *Swap ‘Eng’ forms* | ||
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| The uppercase letter Eng *Ŋ*, i.e. an *N* with a descending tail on the right leg, uses the capital *N* glyph as its base instead of the default enlarged lowercase *n* glyph. | ||
| The localized `locl` UC Style for Sami is changed the other way around. |
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