If you are converting existing HTML documents to XHTML format, you may find some <meta> tags are written as:

<meta name="Author" content="rendc.org">

<meta name="Description"

content="Tutorials, FAQs and Tips on XHTML Documents.">

<meta name="Keywords"

content="XHTML Tutorials, FAQs, Tips">

But all those <meta> tags are invalid in a XHTML document. They must be closed as:

<meta name="Author" content="rendc.org"/>

<meta name="Description"

content="Tutorials, FAQs and Tips on XHTML Documents."/>

<meta name="Keywords"

content="XHTML Tutorials, FAQs, Tips"/>

Note to HTML document authors: <meta> tag syntax in XHTML is the opposite to <meta> tag syntax in HTML. In XHTML, meta tag must be closed. But in HTML, meta tag can not be closed.