What was the <![CDATA[ tag used for?</h1>
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<span class="hide">2020-11-28 08:44</span>
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<p>Does anyone remember the <code>XMP</code> tag?</p>
<p>What was it used for and why was it deprecated?</p>
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<span>2020-11-28 09:30</span>
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<p>A quick Google search on W3C reveals that <code>XMP</code> was introduced for displaying <strong>preformatted text</strong> in HTML 3.2 and earlier. When W3C deprecated the <code>XMP</code> tag, it suggested using the <code>PRE</code> tag as a preferred alternative.</p>
<p>Update: http://www.w3.org/TR/REC-html32#xmp, http://www.w3.org/MarkUp/html-spec/html-spec_5.html#SEC5.5.2.1</p>
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<span>2020-11-28 09:34</span>
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<p><code>XMP</code> and <code>PRE</code> differ. Content within <code>PRE</code> tags is formatted as follows:</p>
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<li>Content is shown with a fixed font,</li>
<li>All whitespace is preserved, and</li>
<li>Each line break begins a new line.</li>
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<p>If you want to include special characters such as <code><</code>, <code>></code> and <code>&</code> within <code>PRE</code> tags, they must be escaped so that they are not subject to special interpretation by the browser.</p>
<p>In contrast, content within <code>XMP</code> tags does <em>not</em> need to be escaped.</p>
<p>The only character sequence that cannot be included within <code>XMP</code> tags is the <code>XMP</code> end tag (<code></XMP></code>).</p>
<p><code>XMP</code> is still supported by the browsers I have tested. You can try it with xmp.html. View the source to see the tags.</p>
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<span>2020-11-28 09:39</span>
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<p>I used <code><textarea></code>, which puts the html code into a neat box and clearly defines the code as different from the text before or after.</p>
<p><code><textarea><b>boldtext</b><textarea></code></p>
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<span>2020-11-28 09:41</span>
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<p>I still use the <code>xmp</code> tag for debugging <code>var_dump();</code> in PHP. I just can't remember to use the <code>pre</code> tag for some reason.</p>
<p>I think it doesn't really matter because if you really want to output text, you should use <code>textarea</code> with the <code>readonly</code> attribute.</p>
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<p>See http://www.w3.org/Bugs/Public/show_bug.cgi?id=12235</p>
<p>For HTML5. it was, according to the HTML5 editor (comments 11 and 12), a very close call either way.</p>
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<p>XMP does some things that PRE does not support. I still depend on XMP, there is <em>no</em> substitute.</p>
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