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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 the links to MDN's documentation on Web technologies.

Web technologies


HyperText Markup Language is the language used to describe and define the content of a Web page in a well structured format .
Cascading Style Sheets are used to describe the appearance of Web content.


JavaScript is the programming language that runs in the browser, which is used to build advanced user interactive Web sites and applications for secure browser execution.
Web APIs
Reference material for each of the individual APIs that comprise the Web's powerful scriptability, including the DOM and all of the related APIs and interfaces you can use to build Web content and apps.


Scalable Vector Graphics let you describe images as sets of vectors (lines) and shapes in order to allow them to scale smoothly regardless of the size at which they're drawn.
WebGL brings 3D graphics to the Web by introducing an API that closely conforms to OpenGL ES 2.0, and which can be used in HTML <canvas> elements.


The Mathematical Markup Language makes it possible to display complex mathematical equations and syntax.

Documentation by type

Web Developer Guide
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
A list of tutorials to take you step-by-step through learning APIs, technologies, or broad topic areas.
This page will offer links to all reference information on MDN, but for now use one of the technology links in the left section.

Other topics

Developing Web applications
Documentation for Web application developers; Web apps are true write-once, deploy anywhere apps for mobile, desktop, and Firefox OS.
Accessibility in Web development means enabling as many people as possible to use Web sites, even when those people's abilities are limited in some way. Here we provide information on developing Web content to be accessible.
Ensuring that your Web site or open Web app is secure is critical.

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