👉 XHTML (Extensible HyperText Markup Language) is a strict, XML-based extension of HTML designed to enhance the structure, accessibility, and interoperability of web content. Unlike traditional HTML, which allows for more permissive markup, XHTML enforces a rigorous set of rules based on XML syntax, requiring all tags to be properly closed and nested. This strict adherence to standards ensures consistent rendering across different browsers and devices, making it easier for developers to create maintainable and scalable web applications. XHTML also supports advanced features like namespaces, which help avoid tag name conflicts, and it promotes semantic markup, enabling better search engine optimization (SEO) and accessibility. By adhering to these standards, XHTML aims to provide a more robust foundation for web development, though its adoption has been limited compared to more flexible HTML5.
