Font guides

Why the same font can get a different line height on macOS and Windows: the three sets of vertical metrics, the USE_TYPO_METRICS flag, and what you can do in CSS.

What font hinting does, where it still matters, how much space removing it can save, and how to decide for your own site by testing both versions.

Ten checks that keep web fonts fast: format, file count, subsetting, font-display, preloading, fallbacks, caching, and how to measure the result.

Desktop apps rarely install WOFF2 files. Why that is, how to convert WOFF2 to TTF or OTF without losing anything, and what to check in the license first.

Remove the characters your site never uses to make font files smaller, then use unicode-range so browsers only download the subsets a page needs.

How to load a variable font with @font-face, control its axes with normal CSS properties, and use font-variation-settings only where you need it.

Turn on tabular figures, small caps, fractions, and stylistic sets in CSS. When to use the font-variant properties and when font-feature-settings is the only option.

Move a Google Font from the hosted API to your own server: download the files, convert them to WOFF2, write the @font-face rules, and remove the old links.