| HTML | XHTML |
|---|---|
| HTML is an acronym that stands for Hypertext Markup Language. It is the most widely used language over the internet. | XHTML is an acronym that stands for Extensible Hypertext Markup Language. |
| HTML is a language used to create web pages and link them from one to another. | XHTML is considered a part of the XML markup language. It contains the features of both XML and HTML. |
| Tim Berners-Lee developed HTML in 1991. | XHTML was developed by W3C, i.e., World Wide Web Consortium, and was released in 2000. |
| HTML is extended from SGML and follows the format of document file format. | XHTML is extended from XML and HTML and follows the markup language format. |
| In HTML, it is not necessary to write Doctype at the top. | In XHTML, you must write Doctype at the top of the file. |
| HTML is not strictly case-sensitive. It is not necessary to put all tags in lower or upper case. | XHTML is strictly case-sensitive. Here, you have to put every tag and attribute in lower case. |
| In HTML, it is not necessary to close the tags in the order they are opened. | In XHTML, you must close the tags in the order they are opened. |
| HTML is an older language for linking web pages on the internet. | In comparison, XHTML is called a better version of HTML. |
| In HTML, it is not necessary to mention quotes while using attributes. For example: <JavaTpoint>. | In XHTML, it is mandatory to mention quotes while using attributes. For example: <JavaTpoint="JTP">. |
| In HTML, filename extensions are used as ".html", and ".htm". | In XHTML, filename extensions are used as ".xhtml", ".xht", ".xml". |
