HTML & Code Quality

Clean, valid, and well-structured code is the foundation of every other quality dimension. Invalid HTML causes unpredictable rendering across browsers. Non-semantic markup harms accessibility and SEO. Unlinted code hides bugs. Inconsistent formatting wastes review time. This topic covers the tools, standards, and practices that keep your codebase healthy from the markup layer all the way through your build pipeline.

1. 1
   HTML Validation & the W3C

   Why valid HTML matters for rendering, accessibility, and SEO — and how to integrate W3C validation into your workflow.
2. 2
   Semantic HTML

   Use the right elements for the right purpose — improving accessibility, SEO, and maintainability without extra ARIA.
3. 3
   Linting & Static Analysis

   Catch bugs, security issues, and code smells automatically with ESLint, Stylelint, Semgrep, SonarQube, and more.
4. 4
   Code Formatting Standards

   Eliminate style debates with Prettier, EditorConfig, and language-specific formatters integrated into your workflow.