How xhtml is different from HTML?

Question

what is xhtml and what are the features of xhtml?

Answer 1

xhtml is based on xml, and thus requires the source to be well-formed. Since xhtml is more strict than html, lesson pre-processing is needed by the rendering engine.

in another words it is a markup language that has the same depth of expression as html, but also conforms to xml syntax.

Answer 2

thanks