Cross-browser compatibility is tough due to divergent engines, implementations, legacy browsers, and device variety; this guide prescribes feature detection (Modernizr), cross-browser CSS with prefixes, Normalize/Reset, responsive design, polyfills/fallbacks, and rigorous manual/automated testing (Selenium/Cypress), plus clean semantic HTML, Sass/Less, modular JS, and CI/CD—illustrated with a responsive e-commerce workflow.
Fullstack.ist offers meaningful insight into a broad range of topics.