The tag used to be <![CDATA[</code> but in HTML 4 it was already deprecated. Browser's don't seem to have dropped its support but I would not recommend it for anything beyond quick debugging. The MDN article about <XMP> lists two other tags, <code><plaintext></code> and <code><listing></code>, that were deprecated even earlier. I'm not aware of any current alternative.</p>
<p>Whatever, the code to encode plain text into HTML is pretty straightforward in most programming languages.</p>
<p>Note: the term <em>similar</em> means exactly that—all three are designed to inject plain text into HTML. I'm not implying that they are synonyms or that they behave identically—they don't.</p>
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