HTML Duplicate ID
The id attribute must be unique in the document. Duplicate IDs break accessibility and JavaScript getElementById.
Common causes
- Same id on two elements.
- Copy-paste without changing id.
How to fix
- Give each element a unique id.
- Use class for shared styling; id for unique.
FAQ
- Can two elements have same id?
- No. id must be unique.
- What if I need same style?
- Use class.
Fix it now
Try in validator (prefill this example)