Document.getElementsByTagName(tagName)

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Returns a NodeList containing all Elements of the given name in the same order as they appear in the source document.

DOMString tagName

-

The name of the tag to match on. The special value "*" matches all tags.

NodeList -  A new NodeList object containing all the matched Elements.

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  var collection = document.getElementsByTagName('LINK');
  var output = collection[1].getAttribute('rel');