what does document.createElement("_") do in javascript [closed]

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Please have a look at https://github.com/eligrey/classList.js/blob/master/classList.js :

if ("document" in self && !("classList" in document.createElement("_"))) {
  //...
}

What is the purpose of document.createElement("_")? I know it creates an html element, but why use _ instead of an html element name?

Answer 1

It creates an element with the tag <_>. I see no reasonable purpose to this.