The LIGA feature controls standard typographic ligatures like fi. Ligatures usually improve the spacing and color of text by fixing troublesome letter pairs that either collide or make awkard spaces.

Harriet has standard ligatures for most f + ascending letter combinations including: ffi, ffj, ffl, ffk, ffh, ffb, fff, fi, fj, fl, fk, fh, fb, and ff. The “Display” forms have a vestigial overlapping ball terminal. The “Text” forms omit that extra detail.

liga can be applied to blocks of text or to individual characters and should be on by default.

Read more about liga on the OpenType liga Spec

The DLIG feature replaces pairs of letters with fancier connected versions.

Harriet has discretionary ligatures for ct and st. These semi-historic forms can help make your text look a little more pretentious.

dlig can be applied to blocks of text or to individual characters.

Read more about dlig on the OpenType dlig Spec

The CALT feature changes the form of some characters when they appear next to other characters so they look better together.

Harriet has alternate f with a shorter arm to avoid awkward collisions when next to accented characters.

calt can be applied to blocks of text or to individual characters and should be on by default.

Read more about calt on the OpenType calt Spec

The SMCP feature turns lowercase letters into small caps.

smcp can be applied to blocks of text or to individual characters.

Read more about smcp on the OpenType smcp Spec

C2SC turns UPPERCASE into small caps. It’s useful for styling things like subheads and dressing up acronyms in running text. C2SC doesn’t touch lowercase so you might want to combine it with SMCP or CASE. Adobe combines the two in their OpenType menu as “All Small Caps”.

In Harriet, C2SC also lowers the quote marks to better align with all small-cap text. You can also access these small-cap -aligned quotes in SS02.

c2sc can be applied to blocks of text or to individual characters.

Read more about c2sc on the OpenType c2sc Spec

The CASE feature shifts some punctuation and symbols to align better with all-cap text. In Okay Type fonts, CASE also changes the numbers from old-style to lining (1234 → 1234). In most Adobe apps, you can quickly apply CASE with ⌘+K. In CSS, you will need to include “text-transform: uppercase;”.

In Harriet, there are case-aligned forms for punctuation, currency symbols, and math symbols: -​–​—​(​)​[​]​{​}​‹​›​«​»​†​‡​©​®​℗​·​¡​¿​•​@​+​−​±​×​÷​=​≠​≈​¬​<​>​≤​≥​∞​#​%​‰​$​¢​€​£​¥​₣. Additionally, in the italic styles the ampersand gets a little larger (H&H → H&H).

case can be applied to blocks of text or to individual characters.

Read more about case on the OpenType case Spec

The LNUM feature accesses lining-height numbers that are align to height of the capitals (0123456789 → 0123456789). In Okay Type fonts, default numbers have proportional widths, so LNUM will need to combined with TNUM to get the tabular-width forms (0123456789 → 0123456789).

In Harriet, LNUM also changes some currency symbols to align better with the cap-height numbers (#%‰$¢€£¥₣ → #%‰$¢€£¥₣).

lnum can be applied to blocks of text or to individual characters.

Read more about lnum on the OpenType lnum Spec

The TNUM feature gives you tabular width numbers. These are useful when you need to neatly align information vertically, like on a chart, spreadsheet, or schedule. In CSS, you can combine TNUM with LNUM to get tabular lining numbers (0123456789). Adobe apps pre-combine LNUM and TNUM in the OpenType menu as "Tabular Lining Figures."

tnum can be applied to blocks of text or to individual characters.

Read more about tnum on the OpenType tnum Spec