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html - Why Can't You Put <body> content in the <head> element?

My friend has tried to code a website like this

<html>
  <head>
    <style>
      h1 {
        color: red;
      }
    </style>
    <div>
      <h1>
        My Website
      </h1>
    </div>
  </head>
  <body>
    <nav>
      <a>example link</a>
    </nav>
</body>

he hasn't used <!DOCTYPE html> and he has also put his page header in the <head> element. when I try to tell him that you need a <!DOCTYPE html> and you cant put content in the <head> element he says well it worked and you still haven't told me what's wrong with doing that. I don't know to explain it to him so can someone please say why you can't do this?

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The structure your friend proposes violates the global structure of an HTML document; the <body> tag must contain the document's actual content, whereas the <head> tag must only contain information describing the document.

The incorrect markup will in fact render correctly on the page, because most browsers are actually intelligent enough to know that the markup is incorrect, and correct it themselves. If you inspect the DOM, you'll find that it has automatically been updated to correctly shift the <div> element (and its content) to within the <body> element (just before <nav>):

Fixed


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