Resources

A collection of external tools and resources not covered by this website.

NB. All links in this section open an external page in the current browser tab or window.

Web general: Can I use... Support tables for HTML5, CSS3, etc; Accessibility Support; Accessibility Developer Guide; MDN Web Docs
Bookmarklets: Zoë Bijl; Table of Contents Bookmarklet; Chris Coyier; 45–75 characters; Gaël Poupard; a11y.css
Color accessibility: MDN; Color contrast; WebAIM; Contrast Checker; WebAIM; Link Contrast Checker
Color palettes: Colormind; AI-powered palette generator; Coolors; Palette generator; Adobe; Color wheel
CSS: CSS Generator Tool
HTML: W3C; Markup Validation Service; FreeFormatter; HTML Entities; Jonathan Aquino; Unclosed Tag Finder; Marijke Luttekes; Kitchen sink
Images: (Real) Favicon Generator; (favicon.io) Favicon Generator; ImageOptim; PNGGauntlet
Math: Calculator Soup; Online Calculators
Motion: CSS-Tricks; Revisiting prefers-reduced-motion, the reduced motion media query
Text: Unicode Text Analyzer
Typography: CSS-Tricks; System Font Stack; DigitalOcean; CSS System Font Stack Reference; CSS Font Stack; Type Scale
Miscellaneous: Tiny Helpers; InputOutput; Paper Sizes Online; Regex101; (Software) EndOfLife.date