# Posts tagged “Semantic HTML”
> Heading hierarchy, landmarks and accessible markup as a machine-readability signal.
2 articles.
## Articles
### The 3-Word Tag That Hides Your Best Pages from AI
- **URL:** https://alexturik.com/blog/the-3-word-tag-that-hides-your-best-pages-from-ai
- **Markdown:** https://alexturik.com/blog/the-3-word-tag-that-hides-your-best-pages-from-ai.md
- **Published:** 2026-05-08 · **Updated:** 2026-08-30
Three words in `` can hide your best article from ChatGPT, Claude, and Perplexity — even if Google still shows it. The silent AEO killer.
### Semantic HTML — Skipping Headings Breaks AI Optimization
- **URL:** https://alexturik.com/blog/semantic-html-for-machines-heading-hierarchy
- **Markdown:** https://alexturik.com/blog/semantic-html-for-machines-heading-hierarchy.md
- **Published:** 2026-05-04 · **Updated:** 2026-08-29
AI crawlers parse your heading outline before anything else. Nothing repairs a skipped level — here's what really breaks, and how to keep structure clean.
All topics: https://alexturik.com/blog/tag