Part of the family of XML markup languages. It mirrors or extends versions of the widely used Hypertext Markup Language (HTML), the language in which web pages are formulated. XHTML was developed by the World Wide Web Consortium (W3C) to help web developers create pages that can be displayed consistently across different types of browsers and devices. It combines the flexibility of HTML with the stricter syntax of XML, ensuring more rigorous coding standards for web development.
History and Development
XHTML was created to bridge the gap between HTML and XML. While HTML, prior to HTML5, was defined as an application of Standard Generalized Markup Language (SGML), XHTML is an application of XML, a more restrictive subset of SGML. This shift ensures that XHTML documents are well-formed and can be parsed using standard XML parsers, unlike HTML, which requires a lenient, HTML-specific parser.
- XHTML 1.0: Became a W3C recommendation on 26 January 2000.
- XHTML 1.1: Became a W3C recommendation on 31 May 2001.
Key Features
XHTML is often referred to as "the XML syntax for HTML" and is developed as an XML adaptation of the HTML living standard. Its key features include:
- Strict Syntax: XHTML enforces stricter syntax rules compared to HTML, ensuring more consistent and error-free web pages.
- Compatibility: Designed to be compatible with existing HTML content, making it easier for developers to transition from HTML to XHTML.
- Portability: XHTML documents can be parsed and displayed consistently across different types of browsers and devices.
Benefits
The primary benefits of using XHTML include:
- Consistency: Ensures that web pages are displayed consistently across different browsers and devices.
- Rigorous Coding Standards: The stricter syntax of XML helps in maintaining higher coding standards, reducing the likelihood of errors.
- Future-Proofing: By adhering to XML standards, XHTML helps in future-proofing web content, making it more adaptable to new technologies and standards.
