Difference between HTML and XHTML

            

             HTML (Hypertext Markup Language) and XHTML (Extensible Hypertext Markup Language) are both markup languages used for creating and displaying web pages. The main difference between them is the syntax and structure; HTML is more lenient in its syntax, while XHTML has a more strict syntax and follows XML rules. XHTML is considered the successor to HTML, and its strict syntax makes it more suitable for future technologies and advancements.

Feature	HTML	XHTML
Definition	Hypertext Markup Language is a markup language used to create web pages and other information that can be displayed in a web browser.	Extensible Hypertext Markup Language is a markup language that is a stricter version of HTML and conforms to XML syntax.
Syntax	HTML allows for loose syntax, with end tags and attributes often being optional.	XHTML requires end tags for all elements and attributes to be quoted.
Document Type Declaration (DTD)	HTML allows for multiple DTDs, including HTML 4.01 and HTML5.	XHTML requires the use of a specific DTD, such as XHTML 1.0 Strict or XHTML 1.1.
Namespaces	HTML does not support namespaces.	XHTML supports namespaces, allowing for the integration of other XML languages.
Attributes	HTML allows for the use of deprecated attributes.	XHTML does not allow the use of deprecated attributes and requires all attributes to be lowercase.
Deprecation	HTML will continue to be supported by web browsers.	XHTML support by web browsers is limited and it is now largely replaced by HTML5.
Future	HTML continues to evolve, with the latest version being HTML5.	XHTML development has largely been discontinued, with future developments focusing on HTML5.