Avoid inline JavaScript

Inline JavaScript breaks browser caching, violates Content Security Policy (CSP), and creates unmaintainable spaghetti code mixing markup with behavior.

Quick Reference

• Move onclick/onmouseover handlers to external JS files
• Use addEventListener instead of inline event handlers
• Exception: critical above-the-fold JS can be inlined
• External files enable browser caching across pages

Check

Verify that JavaScript code is not mixed with HTML markup using external script files and proper separation of concerns for better maintainability and performance.

Fix

Move inline JavaScript to external files, implement proper event handling, and use modern JavaScript patterns for DOM interaction.