What is the difference between xhtml and html

XHTML and HTML are two different markup languages. HTML is a standard markup language developed by the W3C, and XHTML is considered the XML version of HTML. Released in 2000, XHTML was designed around the XML specification, with its main goals being compatibility with XML and stricter document parsing and error handling.

XHTML is a strict, modular, and more restrictive subset of HTML. It has more rules, such as tags must be closed properly, tags must be lowercase, tag attributes must be quoted, and strict document structure must be adhered to. This is different from HTML, which allows developers to pay more attention to the document structure and better ensure the readability and maintainability of the document.

In contrast, HTML is more tolerant. This means that if a syntax error occurs, the browser can still parse and render the document correctly. For XHTML, this tolerance is very limited. If there are grammatical errors in the document, the browser may not be able to parse and render the document correctly.

Another important advantage of XHTML is the consistency of its document structure, which makes it very flexible when transferring data between Web services and applications. At the same time, XHTML can also use CSS as a style sheet to separate the appearance and structure of the document.

In general, XHTML is a more strict and modular markup language, which provides better code structure and maintainability. However, due to its strict syntax requirements, it is more cumbersome than standard HTML, especially in terms of development speed. For novice developers, HTML may be easier to learn and faster to implement. For more rigorous and guaranteed document structure needs, XHTML may be a better choice.

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