doctype, html,head, body, and title
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This ensures that the script text does not appear in the page.
The requirement for a valid XHTML is that all the tags should be closed. This is actually the difference between HTML and XHTML.
You code the webpage with XHTML and you add a Cascading Style Sheet for the styles, linking to it in the head of the XHTML page. It is also possible to incorporate the style directly into the head of the XHTML webpage.
Yes it is. the xhtml 1.0 to be precise!
XHTML is an aberration for Extensive Hyper Text Markup Language. It is the tighter form of HTML but is similar.