'What is an anonymous inline box?

A website was explaining about something called an "anonymous inline box" and has this example:

<p> Some <em> emphasize </em> text </p>

The block-level box generated by the p element only contains inline elements. The inline box of the text "emphsize" is formed by the <em> tag, so it is not an anonymous box, and the text "Some" and "text" do not have corresponding tags to wrap them, so Surrounding them is the anonymous inline box.

Can I say that any text that is not wrapped inside the tags are anonymous box or is it just true for this situation?

I would appreciate if you could help me understand it a little better.



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