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The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
- Overview
- Key resources
- Beginner's tutorials
- Advanced topics
- Reference
- Related topics
HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides HTML are generally used to describe a web page's appearance/presentation (CSS) or functionality/behavior (JavaScript).
"Hypertext" refers to links that connect web pages to one another, either within a single website or between websites. Links are a fundamental aspect of the Web. By uploading content to the Internet and linking it to pages created by other people, you become an active participant in the World Wide Web.
HTML uses "markup" to annotate text, images, and other content for display in a Web browser. HTML markup includes special "elements" such as , , , , , , , , , , , , , , , , , , , , , , , , and many others.
An HTML element is set off from other text in a document by "tags", which consist of the element name surrounded by "<" and ">". The name of an element inside a tag is case-insensitive. That is, it can be written in uppercase, lowercase, or a mixture. For example, the tag can be written as , , or in any other way. However, the convention and recommended practice is to write tags in lowercase.
HTML Introduction
If you're new to web development, be sure to read our HTML Basics article to learn what HTML is and how to use it.
HTML Tutorials
For articles about how to use HTML, as well as tutorials and complete examples, check out our HTML Learning Area.
HTML Reference
In our extensive HTML reference section, you'll find the details about every element and attribute in HTML.
Our HTML Learning Area features multiple modules that teach HTML from the ground up — no previous knowledge required.
Introduction to HTML
This module sets the stage, getting you used to important concepts and syntax such as looking at applying HTML to text, how to create hyperlinks, and how to use HTML to structure a web page.
Multimedia and embedding
This module explores how to use HTML to include multimedia in your web pages, including the different ways that images can be included, and how to embed video, audio, and even entire other webpages.
HTML tables
CORS enabled image
The crossorigin attribute, in combination with an appropriate CORS header, allows images defined by the element to be loaded from foreign origins and used in a element as if they were being loaded from the current origin.
CORS settings attributes
Some HTML elements that provide support for CORS, such as or , have a crossorigin attribute (crossOrigin property), which lets you configure the CORS requests for the element's fetched data.
Preloading content with rel="preload"
The preload value of the element's rel attribute allows you to write declarative fetch requests in your HTML , specifying resources that your pages will need very soon after loading, which you therefore want to start preloading early in the lifecycle of a page load, before the browser's main rendering machinery kicks in. This ensures that they are made available earlier and are less likely to block the page's first render, leading to performance improvements. This article provides a basic guide to how preload works.
HTML reference
HTML consists of elements, each of which may be modified by some number of attributes. HTML documents are connected to each other with links.
HTML element reference
Browse a list of all HTML elements.
HTML attribute reference
Elements in HTML have attributes. These are additional values that configure the elements or adjust their behavior in various ways.
Applying color to HTML elements using CSS
This article covers most of the ways you use CSS to add color to HTML content, listing what parts of HTML documents can be colored and what CSS properties to use when doing so. Includes examples, links to palette-building tools, and more.
Mar 5, 2024 · JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.
Aug 31, 2024 · The Web Developer Guide provides useful how-to content to help you actually use Web technologies to do what you want or need to do. Tutorials for Web developers. Tutorials to take you step-by-step through learning HTML, CSS, JavaScript, and Web APIs. Accessibility.
Firefox Developer Edition is the blazing fast browser that offers cutting edge developer tools and latest features like CSS Grid support and framework debugging
Jul 26, 2024 · The background-size property is specified in one of the following ways: Using the keyword values contain or cover. Using a width value only, in which case the height defaults to auto. Using both a width and a height value, in which case the first sets the width and the second sets the height. Each value can be a <length>, a <percentage>, or ...
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May 25, 2017 · JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them.
