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Comment by taylorfausak | Hacker News Reader

I hadn't heard of the <xmp> tag before now. His reasoning ("so that users don't have to escape special HTML characters") seems to be correct, except that it's a deprecated tag (http://stackoverflow.com/q/4545). Perhaps he used a <textarea> on this page so he could have the literal "</xmp>" in it?

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That's correct. Although the tag is deprecated, I've tried it with all modern browsers (IE and mobile Safari included), and it seems to work just fine.

I'd think it would take a long time to phase this tag out as it was apparently popular among HTML spec writers, which means there's probably a ton of them still in the wild:

https://www.w3.org/Bugs/Public/show_bug.cgi?id=12235

Couldn't you just escape it, i.e.

    <\/xmp>

inside the text?

There's no provision for escaping things inside an <xmp> tag. From the HTML 2.0 spec: "no markup except the end-tag […] is recognized" http://www.w3.org/MarkUp/html-spec/html-spec_5.html#SEC5.5.2...

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