Web Coder
Give your coding agent consistent expertise across HTML, CSS, JavaScript, web APIs, HTTP semantics, security, performance, and accessibility whenever you touch the web stack.
Overview
Web Coder is a journey-wide agent skill that applies expert web standards knowledge—HTML, CSS, JS, HTTP, security, performance, and accessibility—whenever a solo builder implements or debugs browser-facing software.
Install
npx skills add https://github.com/github/awesome-copilot --skill web-coderWhat is this skill?
- Covers HTML semantics, CSS, JavaScript, and DOM/Fetch/WebSocket-class web APIs
- HTTP/HTTPS, caching, CORS, CSP, and authentication guidance for full-stack web work
- WCAG and ARIA accessibility patterns alongside performance tactics like lazy loading and code splitting
- W3C and WHATWG standards framing for spec-aligned implementations
- Translates vague web requirements into standards-compliant, performant solutions
Adoption & trust: 5.6k installs on skills.sh; 34.6k GitHub stars; 3/3 security scanners passed (skills.sh audits).
What problem does it solve?
You need reliable, standards-literate answers across the full web stack instead of generic snippets that miss HTTP, security, or accessibility implications.
Who is it for?
Indie developers shipping SaaS, extensions, or APIs who want one skill to guard web correctness across features and refactors.
Skip if: Pure mobile-native or embedded projects with no HTML, HTTP, or browser runtime involvement.
When should I use this skill?
Working with HTML, CSS, JavaScript, web APIs, HTTP/HTTPS, web security, performance optimization, accessibility, or any web/internet concepts.
What do I get? / Deliverables
Your agent proposes spec-aligned, performant, and accessible web solutions with correct protocol and API vocabulary for the task at hand.
- Standards-aligned implementation guidance
- Security and performance recommendations
- Accessible markup and API usage patterns
Recommended Skills
Journey fit
Useful at every journey phase - explore requirements and options before committing to a direction.
Where it fits
Implement accessible form components with correct ARIA roles before shipping a settings page.
Design REST responses and cache headers a browser client will consume safely.
Review CORS and CSP policies before exposing a new API route to production.
Tune HTML semantics, meta tags, and lazy-loading for landing-page Core Web Vitals.
Diagnose intermittent 401/403 or mixed-content failures reported from user browsers.
How it compares
Use as embedded web expertise in the agent, not as a substitute for framework-specific CLI scaffolders or dedicated security audit skills.
Common Questions / FAQ
Who is web-coder for?
Solo builders and small teams using Claude Code, Cursor, or Copilot-class agents who regularly implement or review web frontends, APIs consumed by browsers, and related networking concerns.
When should I use web-coder?
At any journey phase when web technology appears—Build for UI and fetch clients, Ship for CSP and auth review, Launch for perf and caching, Operate when tracing HTTP or WebSocket failures, Validate when scoping a browser-based prototype.
Is web-coder safe to install?
It is primarily procedural knowledge; confirm comfort with the skill source on this page’s Security Audits panel before adding it to your agent bundle.
SKILL.md
READMESKILL.md - Web Coder
# Web Coder Skill Transform into an expert 10x web development engineer with deep knowledge of web technologies, internet protocols, and industry standards. This skill enables you to communicate effectively about web concepts, implement best practices, and navigate the complex landscape of modern web development with precision and expertise. Like a seasoned web architect who speaks fluently across all layers of the web stack—from HTML semantics to TCP handshakes—you can translate requirements into standards-compliant, performant, and accessible web solutions. ## When to Use This Skill - Working with HTML, CSS, JavaScript, or any web markup/styling/scripting - Implementing web APIs (DOM, Fetch, WebRTC, WebSockets, etc.) - Discussing or implementing HTTP/HTTPS protocols and networking concepts - Building accessible web applications (ARIA, WCAG compliance) - Optimizing web performance (caching, lazy loading, code splitting) - Implementing web security measures (CORS, CSP, authentication) - Working with web standards and specifications (W3C, WHATWG) - Debugging browser-specific issues or cross-browser compatibility - Setting up web servers, CDNs, or infrastructure - Discussing web development terminology with collaborators - Converting web-related requirements or descriptions into code ## Prerequisites - Basic understanding of at least one area of web development - Access to web development tools (browser, editor, terminal) - Understanding that web development spans multiple disciplines ## Core Competencies As a web coder, you possess expert knowledge across 15 key domains: ### 1. HTML & Markup Semantic HTML5, document structure, elements, attributes, accessibility tree, void elements, metadata, and proper markup patterns. **Key Concepts**: Semantic elements, document structure, forms, metadata **Reference**: [HTML & Markup Reference](references/html-markup.md) ### 2. CSS & Styling Cascading stylesheets, selectors, properties, layout systems (Flexbox, Grid), responsive design, preprocessors, and modern CSS features. **Key Concepts**: Selectors, box model, layouts, responsiveness, animations **Reference**: [CSS & Styling Reference](references/css-styling.md) ### 3. JavaScript & Programming ES6+, TypeScript, data types, functions, classes, async/await, closures, prototypes, and modern JavaScript patterns. **Key Concepts**: Types, control flow, functions, async patterns, modules **Reference**: [JavaScript & Programming Reference](references/javascript-programming.md) ### 4. Web APIs & DOM Document Object Model, Browser APIs, Web Storage, Service Workers, WebRTC, WebGL, and modern web platform features. **Key Concepts**: DOM manipulation, event handling, storage, communication **Reference**: [Web APIs & DOM Reference](references/web-apis-dom.md) ### 5. HTTP & Networking HTTP/1.1, HTTP/2, HTTP/3, request/response cycle, headers, status codes, REST, caching, and network fundamentals. **Key Concepts**: Request methods, headers, status codes, caching strategies **Reference**: [HTTP & Networking Reference](references/http-networking.md) ### 6. Security & Authentication HTTPS, TLS, authentication, authorization, CORS, CSP, XSS prevention, CSRF protection, and secure coding practices. **Key Concepts**: Encryption, certificates, same-origin policy, secure headers **Reference**: [Security & Authentication Reference](references/security-authentication.md) ### 7. Performance & Optimization Load times, rendering performance, Core Web Vitals, lazy loading, code splitting, minification, and performance