HTML 5 and Related Web Development Technologies

Markup Languages
HTML 5
HTML 5 is the current generation of the Hypertext Markup Language. It is based on SGML and can be serialized using either xHTML syntax, the XML-based serialization of HTML, or legacy HTML syntax.
XML
SGML
MathML
Mathematical markup language
SVG
Scalable vector graphics

Microdata in HTML

Style Sheets
Cascading Style Sheets (CSS)
Extensible Style Sheets
Extensible Style Sheet Language (XSL) and XSL Transformations (XSLT)

Scripting Languages
JavaScript

Object Models
Document Object Model (DOM)