How to get html element's class tags

I will go for:

document.documentElement.className;

Because doesn't involve any function's call, neither an additional layer like jquery. Ideally this one is the cleanest and the fastest.

you can use jQuery hasClass` method:

Determine whether any of the matched elements are assigned the given class.

if ( $('html').hasClass('no-something')) {
  // do something here
}

If using plain JS, the equivalent would be:

document.getElementsByTagName('html')[0].className

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