This tag is officially deprecated. That means that this tag is being phased out, and it is strongly suggested that you not use it.
<PLAINTEXT> is the unstoppable monster of HTML.
<PLAINTEXT> causes all remaining text in the document to be rendered exactly as it was typed in, including all tags and even the document tags. Whereas
<XMP> ignores formatting from its own start to its own end,
<PLAINTEXT> ignores all formatting for the rest of the document, displaying all text exactly as is. It cannot be stopped, it cannot be turned off.
<PLAINTEXT> is deprecated because it messes up the balance of the document tags (
<BODY ...> to name a few).
This document produces this document:
<HEAD><TITLE>Everyone Named Joe</TITLE></HEAD>
<H1>Everyone Named Joe</H1>