ReadonlylengthThe HTMLCollection.length property returns the number of items in a HTMLCollection.
The HTMLCollection method item() returns the element located at the specified offset into the collection.
The HTMLFormControlsCollection.namedItem() method returns the RadioNodeList or the Element in the collection whose name or id match the specified name, or null if no node matches.
The
HTMLFormControlsCollectioninterface represents a collection of HTML form control elements, returned by the HTMLFormElement interface's HTMLFormElement.elements property.MDN Reference