How is it that having sibling element after the BODY element allowed in HTML specification?

Giganews Newsgroups
Subject: How is it that having sibling element after the BODY element allowed in HTML specification?
Posted by:  JJ (jj4publ…@vfemail.net)
Date: Thu, 22 Nov 2018

As seen in below screenshot. The two `STYLE` elements at the end, which were
added by the Stylus Firefox addon.

https://i.imgur.com/a8t134l.jpg

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