Answers for "difference between html xml and xhtml"

differences between html and xhtml

In HTML, you can do this:
<meta charset="UTF-8"> and <meta charset="UTF-8" />
In XHTML you have to do this:
<meta charset="UTF-8" />
You can also do this in XHTML:
<custom-tag />
but you can't in HTML.

xml vs html

The most salient difference between HTML and 
XML is that HTML describes presentation and XML describes content. 

An HTML document rendered in a web browser is human readable. 

XML is aimed toward being both human and machine readable.