How HTML works
An HTML document is a text file made of elements. Most elements have an opening and a closing tag around their content, and tags can carry attributes that add detail:
<h1>Our services</h1> <p>We help local businesses get found on <a href="/local-seo/">Google Maps</a>.</p>
The browser reads the HTML, builds the page from it and displays it. CSS controls how the page looks, and JavaScript adds interactive behavior. The three work together: HTML is the structure, CSS the style and JavaScript the behavior.
Common HTML elements
| Element | What it does |
|---|---|
| <h1> to <h6> | Headings, from the main title down to sub-sections |
| <p> | A paragraph of text |
| <a href=”…”> | A hyperlink to another page |
| <img src=”…” alt=”…”> | An image, with alt text that describes it |
| <ul>, <ol>, <li> | Bulleted and numbered lists |
| <table> | Data in rows and columns |
| <form>, <input> | Forms that collect information |
| <nav>, <main>, <article> | Semantic elements that say what a section of the page is |
Why HTML matters for SEO
- The title tag and meta description shape how the page appears in search results.
- Headings (H1 to H6) show the structure of the content.
- Links with descriptive anchor text help search engines discover and understand pages.
- Alt text on images describes them to search engines and screen readers.
- Semantic elements such as <nav>, <main> and <article> make the page easier to interpret.
- Clean, valid HTML helps a crawler read the page, and important text should be in the HTML, not only added later by scripts.
History and versions
Tim Berners-Lee created HTML in the early 1990s to share documents on the web. Versions followed through HTML 4 and XHTML. The current version is the HTML Living Standard, maintained by the WHATWG and commonly called HTML5. It is a living standard, so it is updated continuously instead of being released as numbered versions.
How to view and learn HTML
Every browser can show a page’s HTML: right-click and choose “View page source”, or open the developer tools and look at the Elements panel. To learn it, the free MDN Web Docs from Mozilla is the usual reference, and you can practice by saving a text file with an .html ending and opening it in a browser.
HTML FAQs
What does HTML stand for?
HyperText Markup Language.
Is HTML a programming language?
No. It is a markup language that describes structure. Programming languages such as JavaScript add logic.
Do I need to know HTML to do SEO?
Not to start, but knowing the basics helps you check titles, headings, links and image alt text, and talk to developers.