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Showing content from https://webplatform.github.io/docs/dom/DOMTokenList/length below:

length · WebPlatform Docs

Returns the number of tokens in a DOMTokenList.

Property of dom/DOMTokenListdom/DOMTokenList

Note: This property is read-only.

var result = element.length;

Returns an object of type NumberNumber

//returns the number of classes in an element's classList (a DOMTokenList)
function elNumClasses(elid) {
  var classes = document.getElementById(elid).classList;
  return classes.length;
}

W3C DOM4

Candidate Recommendation

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