HTML & XHTML

Hi Deepk Ji

Difference between HTML & XHTML are as follows:-
XHTML is a stricter and cleaner version of HTML.

The most important difference between the two markup languages is that

HTML stands for HyperText Markup Language.
XHTML stands for EXtensible HyperText Markup Language.
HTML, is an application of SGML (Standard Generalized Markup Language).
XHTML, is an application of XML (Extensible Markup Language).
HTML permits the omission of any tags.
XHTML doesn't permit the omission of any tags.
Attribute Names are not case sensitive in HTML.
Attribute Names are case sensitive in XHTML.
HTML is not supported by all major browsers.
XHTML is supported by all major browsers.
HTML elements may be in lowercase or uppercase.
XHTML elements must be in lowercase.
XHTML elements must always be closed.