dark mode favicon
/* HTML */ <link rel="icon" href="/favicon.svg" type="image/svg+xml"> /* SVG image */ <svg width="50" height="50" viewBox="0 0 50 50" xmlns="http://www.w3.org/2000/svg"> <style> rect { fill: green; } @media (prefers-color-scheme: dark) { rect { fill: red; } } </style> <rect width="50" height="50" rx="5"/> </svg>