What is XHTML?
XHTML (Extensible HyperText Markup Language) is a stricter, XML-based reformulation of HTML that requires well-formed markup, proper nesting, and lowercase tag names, combining the flexibility of HTML with the rigorous syntax rules of XML.
How Does Xhtml Work?
XHTML was developed by the W3C as a bridge between HTML and XML, enforcing rules such as mandatory closing tags, quoted attribute values, and proper element nesting. Unlike regular HTML, which browsers parse leniently and attempt to correct, XHTML documents must be well-formed XML or the browser will display an error. This strictness was intended to improve interoperability and make web content easier to process by machines.
While XHTML was widely adopted in the early 2000s and influenced web development practices, the web community largely moved to HTML5, which provides a more practical balance between strictness and flexibility. However, the discipline that XHTML encouraged, such as writing clean and well-structured markup, remains a best practice in modern web development. XHTML is still encountered in legacy projects and specialized XML-based workflows.