Digital marketing term
HTML
The markup a browser uses to build a page’s structure: headings, paragraphs, links, and forms. CSS paints it and JavaScript makes it interactive; markup itself is not a programming language.
Detailed explanation
Tags in the page source tell the browser what is a heading, a list, or a link. Title, heading order, and image alt text hang on that skeleton—for accessibility and for on-page SEO.
Common failures are div soup, missing alt, multiple h1s, and broken internal links. Critical copy injected only by JavaScript may render for users and still be weak for crawling and snippets.
Check View Source, the accessibility tree, and Search Console HTML issues. JSON-LD does not replace visible markup; the content still has to live in the document.
Frequently asked questions
- Is HTML a programming language?
- No. It describes structure. Behavior sits in JavaScript; presentation sits in CSS.
- Which tags should you fix first for search?
- Title, one clear h1, logical headings, descriptive link text, and image alt. Those carry both the snippet and accessibility.
Related terms
Internal links for the topic cluster — read these concepts together.
- CSSThe stylesheet language that sets color, type, space, and layout on an HTML page. It decides how the interface looks and how interactions feel in the browser.
- JavaScriptThe language that makes pages interactive in the browser: menus, form checks, tag managers, and most modern UI. HTML structures the page, CSS styles it, and this layer handles behavior.
- BrowserThe software that fetches HTML, CSS, and JavaScript and paints the page—Chrome, Safari, Edge, Firefox. Tracking, login, and speed all differ by browser.
- Title TagThe primary HTML title for a page: browser tab, SERP headline, and a core on-page ranking cue. A vague or duplicated title wastes both clicks and the strongest keyword placement you have.
- On-Page SEOThe ranking and click work you do in a page’s own code and copy: title, structure, internal links, speed, and intent match. A vote from another site is off-page, not this.
- CMSSoftware that separates content from code so editors can ship pages, images, and URLs as HTML. You should not need an FTP login for every glossary update.