Is it possible to code XHTML and HTML5 together? : <p>I have seen on several occasions that some companies are looking for web developers who know how to program in html5 and xhtml. I wonder why they specify xhtml. I do not know if these languages are used separately or if you can join strengths in the same file.</p>

<p>I'm sorry if my English is not very good and if my question is novice. Thank you</p>
