What is HTML?
HTML is the standard markup language that structures web pages and tells browsers how to display text, links, images, and other content.
HTML stands for HyperText Markup Language. It’s the code that tells a browser what to put on a page and how to organise it. Every web page you’ve ever visited is built on HTML at its core.
It’s not a programming language. You can’t use HTML to run calculations or process data. It’s a markup language: you wrap content in tags, and the browser reads those tags to know what to display and where.
How HTML Works
HTML uses elements made up of opening and closing tags. A tag is a keyword wrapped in angle brackets. The opening tag starts the element, the closing tag ends it, and the content sits between them.
A heading looks like this:
<h1>Best Web Hosting Providers</h1>
A paragraph looks like this:
<p>Finding the right host depends on your needs and budget.</p>
A link looks like this:
<a href="https://topsitehosters.com">Visit TopSiteHosters</a>
The browser reads these tags and renders the content accordingly. You don’t see the tags when you visit a site. You see the result of them.
Some elements don’t need a closing tag. An image is a good example:
<img src="logo.png" alt="TopSiteHosters logo">
These are called void elements. They can’t contain content, so there’s nothing to close.
The Basic Structure of an HTML Page
Every HTML page follows a standard structure. Browsers expect this layout, and deviating from it can cause rendering issues.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Page Title</title>
</head>
<body>
<h1>Main Heading</h1>
<p>Content goes here.</p>
</body>
</html>
The <!DOCTYPE html> declaration tells the browser this is an HTML5 document. Without it, some browsers enter quirks mode and render things differently.
The <head> section contains information about the page: the title, meta descriptions, links to stylesheets, and character encoding. None of this appears on the page itself. The <body> is what visitors actually see.
The <meta name="viewport"> tag is particularly important for mobile. It tells the browser to scale the page to the device width rather than rendering a desktop-width layout and shrinking it down.
Common HTML Elements
You don’t need to memorise every HTML element, but a handful appear on almost every page.
Headings run from <h1> to <h6>, with <h1> being the most important. Search engines use heading hierarchy to understand page structure. Each page should have one <h1> and use <h2> through <h6> to organise subsections.
Paragraphs use <p> tags. Every block of text on a page should sit inside a paragraph tag rather than floating loose in the body.
Links use <a href="URL"> tags. The href attribute defines where the link goes. Links can point to other pages, anchor points on the same page, email addresses, or files.
Images use <img src="URL" alt="description">. The alt attribute provides a text description for screen readers and search engines. Missing alt text is one of the most common accessibility failures on web pages.
Lists come in two flavours: <ul> for unordered (bulleted) lists and <ol> for ordered (numbered) lists. Each item inside uses <li> tags.
Divs and spans are generic containers. <div> is a block-level container used to group sections. <span> is an inline container used to target a piece of text within a paragraph. Both are used heavily with CSS to apply styles.
Semantic HTML
HTML5 introduced semantic elements: tags that describe the meaning of their content rather than just how it looks.
Instead of using <div> for everything, you can use <header>, <nav>, <main>, <article>, <section>, <aside>, and <footer>. These tell browsers, screen readers, and search engines what role each part of the page plays.
A well-structured WordPress theme uses semantic HTML throughout. The main navigation sits in a <nav>. The post content sits in an <article>. The sidebar sits in an <aside>. This structure helps Google understand the page and helps assistive technologies navigate it correctly.
Using semantic HTML properly is also an SEO signal. Google’s documentation explicitly recommends it as a way to help crawlers understand page structure.
HTML and Hosting
Your HTML files live on your hosting server. When someone visits your site, the server sends those files to their browser, which then renders them into the page they see.
For a simple static site, HTML files are all you need. No database, no PHP, no server-side processing. A static site generator like Hugo or Eleventy produces pure HTML files that a host like Netlify or Cloudflare Pages can serve at extremely low cost and very high speed.
For WordPress and other platforms, PHP generates the HTML dynamically on each request. The browser receives HTML either way. It doesn’t know or care where it came from.
Good hosting keeps HTML delivery fast. A slow server means a slow response time before a single byte of HTML reaches the visitor. That’s why TTFB matters: it’s the gap between request and the first chunk of HTML arriving. Server-side caching helps by storing pre-built HTML so the server doesn’t have to generate it from scratch every time.
The size of your HTML also matters for LCP. Keeping your largest above-the-fold element in the initial HTML payload, rather than loaded later by JavaScript, is one of the most effective ways to improve your Core Web Vitals score.
HTML vs Other Web Technologies
HTML doesn’t work alone. Three technologies work together to build what you see in a browser.
HTML provides the structure and content. CSS provides the styling: colours, fonts, layout, spacing. JavaScript provides interactivity: dropdown menus, form validation, dynamic content loading. Remove CSS and the page is still readable but unstyled. Remove JavaScript and most pages still work, just without interactive features. Remove HTML and there’s nothing to style or make interactive.
PHP, Python, and other server-side languages generate HTML dynamically. They run on the server, pull data from a database, and produce an HTML document that gets sent to the browser. The browser never sees the PHP. It only ever receives HTML.
Frequently Asked Questions
Do I need to know HTML to use WordPress? Not for day-to-day tasks. WordPress generates HTML for you through its editor. That said, knowing basic HTML helps when you want to fix formatting issues, embed something custom, troubleshoot layout problems, or understand what your page builder is actually producing. It’s a skill worth having even if you use WordPress exclusively.
What’s the difference between HTML and CSS? HTML handles structure and content. CSS handles how that content looks: colours, fonts, layout, spacing. They work together but do different jobs. An HTML page without CSS is plain and unstyled. CSS without HTML has nothing to style.
What’s the difference between HTML and PHP? HTML is static. Write it, and it stays the same for every visitor. PHP is a programming language that runs on the server and generates HTML dynamically. WordPress is written in PHP. Every time someone loads a WordPress page, PHP runs, pulls content from the database, and produces HTML that gets sent to the browser. The visitor only ever receives HTML.
Is HTML5 different from HTML? HTML5 is the current version of HTML. It added semantic elements like <article>, <section>, <video>, and <canvas> that make it easier to build modern web pages without workarounds. It also standardised features like local storage and geolocation APIs. Most browsers have supported HTML5 for years. When people say “HTML” they almost always mean HTML5 now.
Can Google read JavaScript-generated content? Google can render JavaScript, but it’s slower and less reliable than reading content in the initial HTML. For SEO, having your main content in the HTML document rather than injected by JavaScript is preferable. This is one reason server-side rendering is preferred for content-heavy sites.
