HTML Tag and name space

  • Howdy! I’m writing a theme from scratch finally. Some have ask me why I would do such a thing and I can only answer…”to be able to say I can”. So having said that, the name space attributes in the html tag has me a bit confused. Why does WordPress include the code <?php language_attributes(); ?> and not just a simple line of code like this.
    <html xml:lang="en" xmlns="https://www.w3.org/1999/xhtml">
    Doesn’t that inclusion carry unnecessary weight and add a call slowing down the processes?

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