XHTML is a stricter, more XML-based version of HTML.

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.

What is HTML Versus XHTML	HTML vs. XHTML
What is XHTML?	HTML vs. XHTML
Why XHTML?	HTML vs. XHTML
What is The Most Important Differences from HTML	HTML vs. XHTML
Why XHTML - <!DOCTYPE> Is Mandatory	HTML vs. XHTML
Why XHTML Elements Must be Properly Nested	HTML vs. XHTML
Why XHTML Elements Must Always be Closed	HTML vs. XHTML
Why XHTML Empty Elements Must Always be Closed	HTML vs. XHTML
Why XHTML Elements Must be in Lowercase	HTML vs. XHTML
Why XHTML Attribute Names Must be in Lowercase	HTML vs. XHTML
Why XHTML Attribute Values Must be Quoted	HTML vs. XHTML
Why XHTML Attribute Minimization is Forbidden	HTML vs. XHTML
How to Validate HTML With The W3C Validator	HTML vs. XHTML

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