HTMLFormElement: relList property

The relList read-only property of the HTMLFormElement interface reflects the rel attribute. It is a live DOMTokenList containing the set of link types indicating the relationship between the resource represented by the <form> element and the current document.

The property itself is read-only, meaning you can not reassign the property with another DOMTokenList, but the content of the returned list can be changed.

To retrieve a string containing the values as space-separated tokens, use HTMLFormElement.rel. The rel property can also be used to set the rel attribute value.

const form = document.querySelector("form");
form.relList.forEach((relEntry) => {
  console.log(relEntry);
});