What Is OpenType Features?
OpenType features are built-in font behaviours that swap or position glyphs on demand — ligatures, small caps, fractions, old-style figures, swashes, and stylistic sets. They let one font file carry rich typographic options that designers enable as needed, without separate "expert" fonts.
Each feature has a four-letter tag (liga for ligatures, smcp for small caps, frac for fractions). Software toggles them, and the underlying text stays plain and searchable.
On the web, OpenType features are controlled with the `font-feature-settings` and `font-variant-*` CSS properties, so a single WOFF2 file can deliver professional typesetting in the browser.