Element Code: HT-040
Quick Reference
Issue: ID attributes not unique
Impact: JavaScript/CSS issues
Fix: Make IDs unique
Detection: Validation
What Is This Issue?
IDs must be unique.
Why This Matters
Breaks selectors.
How to Fix
- Fix duplicate IDs
Tools
- Validator: ID check
TL;DR
Make all IDs unique.
Claude Vincent is a technical SEO consultant focused on crawlability, rendering, and AI-search visibility. He writes the field guides and case studies at SEO ProCheck, with a bias toward the durable, unglamorous work that decides whether search engines and AI answer engines can actually read and cite a site.
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