# What Is Semantic HTML? A Shared Foundation for Accessibility and SEO

Last updated: 2026-09-30

Traditional Chinese version：[https://accesserty.com/ai/glossary/semantic-html.md](https://accesserty.com/ai/glossary/semantic-html.md)

Page version：[https://accesserty.com/en/glossary/semantic-html/](https://accesserty.com/en/glossary/semantic-html/)

Semantic HTML uses the correct elements for structure and behavior so browsers, assistive technologies, and search engines can understand the page.

## In brief

- Semantic HTML is a shared foundation for accessibility and SEO.
- Use the correct native element before adding ARIA.
- Headings, landmarks, buttons, links, and form semantics affect assistive technology understanding.

## Common principles

Buttons perform actions, links navigate, labels name fields, and headings express hierarchy. Choosing native elements by purpose is easier to maintain than rebuilding semantics and behavior on divs.

For example, a native submit button normally supplies a role, focus, and keyboard activation. A div with role="button" supplies a role, not automatic keyboard activation or disabled behavior. Native elements still need appropriate names and styles; the element alone does not prove the whole component accessible.

## Frequently asked questions

### Does semantic HTML help SEO?

Clear structure helps describe content and purpose, but does not guarantee search rankings. Use semantic HTML to expose correct structure and behavior to browsers and assistive technologies, not as a tag-stacking ranking tactic.

## Related pages

- [Choose between native HTML and ARIA](https://accesserty.com/en/guides/aria-patterns-for-developers/)
- [Understand ARIA capabilities and limits](https://accesserty.com/en/glossary/aria/)
- [Load components in plain HTML](https://accesserty.com/en/uikit/)

## References

- [MDN HTML elements reference](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements)