I want to determine more than one language for a document, because it's available in more than one language. If I use:

<meta http-equiv="content-language" content="en,de,fr" />

this is not W3C valid and the validator says I should define it in the root's lang attribute, but this attribute only supports one language:

<html lang="en">

works, but not

<html lang="de,en,fr">

So where should I define it?

html html-meta lang
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