HTML, or Hypertext Markup Language, is the foundational building block for creating and structuring content on the web. It provides the basic framework by allowing developers to define elements such as headings, paragraphs, links, images, and more through a system of tags and attributes. HTML is not a programming language, as it lacks logic and processing abilities; rather, it is a markup language that describes the semantics of content in a document. Modern HTML5, the latest version, offers rich media support, improved accessibility features, and enhanced web performance capabilities through native APIs like video, audio, and canvas. For application developers, mastering HTML is crucial for creating accessible and SEO-friendly web pages, and for working seamlessly in concert with other technologies like CSS and JavaScript to build dynamic, interactive applications. Understanding HTML's document structure, elements, and their proper nesting within a DOM is vital in crafting well-organized websites and applications that behave predictably across different browsers and devices.

View the most prominent open source HTML projects in the list below. Click on a specific project to view its alternative or complementary packages.