The latest revision of the standard called HyperText Markup Language (HTML) is HTML 5. It is a language used to structure and present Web content. HTML 5 is currently under development, with the most recent version of HTML being 4, which was standardized in 1997. It should not be used with email marketing software as it is not yet supported. The goals of HTML 5 are to improve the language by providing support for current multimedia while at the same time being easily read by humans and understood consistently by computers and other devices like Web browsers.

Developers can access HTML 5 tutorials online that teach them the new features of this next generation of HTML. This version is designed to replace HTML 4, DOM2HTML (JavaScript, in particular), and XHTML 1. It represents a response to those who observed that XHTML and HTML frequently used on the Web contain a mixture of features of different specifications, software products, and common practices.

When HTML 5 is officially released, it will serve as a single markup language that can be written in XHTML or HTML syntax. email marketing platforms will eventually support it. Included are detailed processing models that encourage implementations that are more interoperable. In addition, the markup currently available for documents will be rationalized, improved, and extended.

APIs and markup for complex applications on the Web will be introduced through HTML 5. New syntax features like canvas, audio, and video elements are added and SVG content is integrated. These make it easier to incorporate and use graphical and multimedia content on the Web without the need for APIs and plugins.

Semantic content of documents will also be enriched due to new elements like nav, header, article, and section. For the same reason, new attributes will be introduced while others will be removed. DOM and APIs are fundamental components of the HTML 5 specification. This new language also specifies how to process invalid documents so user agents like conforming browsers can treat syntax errors uniformly.