best-practices

Modern web development standards covering security, compatibility, and code quality patterns. Modern web development standards based on Lighthouse best practices audits. Covers security, browser compatibility, and code quality patterns. Enforce HTTPS: HSTS Header: CSP Header (recommended): Using nonces for inline scripts: Keep dependencies updated: Known vulnerable patterns to avoid: - Enforces HTTPS, Content Security Policy, and security headers to prevent XSS, clickjacking, and mixed-content vulnerabilities - Addresses browser compatibility through proper doctype, charset, viewport configuration, and feature detection instead of user-agent sniffing - Covers deprecated APIs (document.write, synchronous XHR, Application Cache) with modern replacements (dynamic script loading, fetch, Service Workers) - Includes code quality checks: valid HTML, semantic markup, error handling, memory cleanup, and passive event listeners for performance - Provides an audit checklist and tools (npm audit, SecurityHeaders.com, W3C Validator, Lighthouse) for systematic best-practices validation - MDN Web Security - OWASP Top 10 - Web Quality Audit