Didn't knew about the (outdated but still working) <xmp> HTML tag. Example: <xmp> This is <just> a test! https://developer.mozilla.org/en-US/docs/Web/HTML/Element/xmp …
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Old School
They look similar: https://jsbin.com/yalumiz/edit?html,output … / https://jsbin.com/dakije/edit?html,output … – But (as you said) <plaintext> can't be closed 
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<xmp> is just a bit shorter, which helps in some of our code golf quines where we used <pre> and escaped "<" before.
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