Modern Font Stacks Modern Font Stacks provides system font stack CSS organized by typeface classification for every modern operating system. It offers the fastest fonts available, ensuring no downloads, no layout shifts, and no flash of unstyled content, resulting in instant rendering. --- Key Features System font stacks organized by typeface classification. Support for every major modern OS. CSS ready to copy & paste. Real-time preview with adjustable font size and weight. Displays availability indicator (Currently In Use, Available, Unavailable). Open source project with GitHub repository for contributions. --- Typeface Classifications & Font Stacks Each class features a preview, weight options (100 to 900), and CSS font-family declaration. System UI A font stack using the default system UI fonts. Transitional Classical serif fonts with moderate stroke contrast. Old Style Traditional serif fonts with moderate stroke contrast and diagonal stress. Humanist Fonts inspired by human handwriting with open forms. Geometric Humanist Clean geometric sans-serif fonts with humanist proportions. Classical Humanist Balanced fonts inspired by classical calligraphy. Neo-Grotesque Popular, straightforward grotesque sans-serif fonts. Monospace Slab Serif Monospaced fonts with slab serifs. Monospace Code Monospaced fonts optimized for programming. Industrial (Display) Strong, condensed fonts suitable for display. Rounded Sans (Display) Sans-serifs with rounded terminals and display focus. Slab Serif (Display) Slab serif fonts ideal for headings. Antique (Display) Traditional serif fonts with an antique appearance. Didone (Display) High contrast serif fonts popular in fashion and luxury branding. Handwritten (Display) Casual, handwritten style fonts. --- Article View Preview A sample article "Alice’s Adventure in Wonderland" by Lewis Carroll is displayed using these font stacks in a readable format. Users can toggle between font classifications to see styles in context. --- Font Character