Is this minimalist HTML5 markup valid?

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<!DOCTYPE html>
<meta charset="utf-8">
<body>
Hello, world!

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If so, besides removing "Hello, world!" is there any tag that's able to be removed and it still be valid, and how do you know it's still valid?

4 Answers

The smallest HTML document for which the Nu Html Checker (the only HTML validator currently endorsed by the WHATWG) does not produce any errors nor warnings is the following:

<!DOCTYPE html>
<html lang="">
<title>x</title>
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