What problem does it solve? Choosing and implementing typefaces for the web involves trade-offs between readability, brand personality, and font-loading performance that are easy to get wrong, resulting in cramped text, invisible hierarchy, FOIT flashes, and bloated font payloads. ## Core Features & Use Cases - Typeface Evaluation and Pairing: Systematic quality checks covering x-height, counters, kerning, character-set completeness, and proven serif/sans pairing strategies with contrast rules. - CSS Implementation Patterns: Ready-to-use @font-face declarations, font-display strategies, variable font setup, system font stacks, OpenType features, and fluid type scales built with clamp(). - Performance and Diagnostics: A 10-point scoring rubric and quick diagnostic table covering body size, measure, line height, font payload under 200KB, fallbacks, and 200% zoom resilience. - Use Case: When redesigning a blog, use this Skill to pick a serif/sans pairing, generate the fluid clamp() type scale, configure font-display: swap with preloaded WOFF2 subsets, and verify the result against the diagnostic checklist. ## Quick Start Ask the assistant to evaluate and improve the typography of your web page, including font pairing, sizes, line height, and loading performance.