JavaScript Errors
This page contains various JavaScript errors and runtime issues. Open the browser console to see the errors.
Bug #1: Undefined Variable Error
Click the button to trigger an undefined variable error.
Bug #2: Null Reference Error
Click the button to trigger a null reference error.
Bug #3: Array Index Out of Bounds
Click the button to access an array element that doesn't exist.
Bug #4: Type Coercion Issue
Click the button to see unexpected type coercion.
Bug #5: Event Listener Not Removed
Click "Add Listener" multiple times, then click the target element. Multiple handlers will trigger.
Bug #6: Async/Await Issue
Click the button to trigger an async error.