The open Web presents incredible opportunities for developers. To take full advantage of these technologies, you need to know how to use them. Below you'll find links to our Web technology documentation.

Documentation for Web developers

Web developer guides

The Web Developer Guides provide practical, how-to content to help you use Web technologies for your goals or needs.

Tutorials for Web developers

Tutorials to take you step-by-step through learning HTML, CSS, JavaScript, and Web APIs.

Accessibility

Enabling as many people as possible to use websites, even when those people's abilities are limited in some way.

Performance

Making content as available and interactive as possible, as soon as possible.

Privacy

Protecting users' personal data.

Security

Protecting users from data leaks and data theft, side-channel attacks, and attacks such as cross-site scripting, content injection, and click-jacking.

Glossary

Definitions of Web-related terms.

Web technology references

Web APIs

JavaScript programming APIs you can use to build apps on the Web.

HTML

HTML provides the fundamental building blocks for structuring Web documents and apps.

CSS

Cascading Style Sheets are used to describe the appearance of Web documents and apps.

JavaScript

JavaScript is the Web's native programming language.

WebAssembly

WebAssembly allows programs written in C, C++, Rust, Swift, C#, Go, and more to run on the Web.

HTTP

HTTP is the fundamental Internet protocol for fetching documents, stylesheets, scripts, images, videos, fonts, and other resources over the Web — and for sending data back to Web servers.

Media

Formats, codecs, protocols, APIs, and techniques for embedding and streaming video, audio, and image content in Web documents and apps.

SVG

Scalable Vector Graphics lets you create images that scale smoothly to any size.

MathML

MathML lets you display complex mathematical notation on the Web.

URI

Uniform Resource Identifiers are used by various technologies, including the browser itself via the address bar, to identify resources in various ways.

WebDriver

WebDriver is a browser-automation mechanism for remotely controlling a browser by emulating the actions of a real person using the browser. It's widely used for cross-browser testing of Web apps.

Web Extensions

Web Extensions are a way for you to give users enhanced capabilities in their browsers — for doing things such as blocking ads and other content, customizing the appearance of pages, and more.

Web App Manifests

Web App Manifests let you enable users to install Web apps to their device home screens, with aspects such as portrait/landscape screen orientation and display mode (e.g., full screen) pre-set.

Progressive Web Apps (PWAs)

Progressive Web Apps provide a user experience similar to native mobile apps.

OpenSearch

OpenSearch allows a website to describe a search engine for itself, so that a browser or other client application can use that search engine.

XML

The Extensible Markup Language is a strict serialization of theDocument Object Model.

XSLT

Extensible Stylesheet Language Transformations is anXML-based language used, in conjunction with specialized processing software, for the transformation of XML documents.

XPath

XPath uses a non-XML syntax to provide a flexible way of addressing (pointing to) different parts of anXML document. It can also be used to test addressed nodes within a document to determine whether they match a pattern or not.

EXSLT

EXSLT a set of extensions toXSLT.

Developer tools documentation

Firefox Developer Tools

Documentation for the set of web-developer tools built into Firefox.

Chrome DevTools

Documentation for the set of web-developer tools built into Chrome.

Safari Web Inspector

Documentation for the set of web-developer tools built into Safari.

Edge DevTools

Documentation for the set of web-developer tools built into Edge.