Returns the specific node whose ID or, as a fallback, name matches the string specified by name.
Returns the specific node whose ID or, as a fallback, name matches the string specified by name. Matching by name is only done as a last resort, only in HTML, and only if the referenced element supports the name attribute. Returns null if no node exists by the given name.
MDN
Returns the specific node at the given zero-based index into the list.
Returns the specific node at the given zero-based index into the list. Returns null if the index is out of range.
MDN
(Since version forever) Non-standard.
HTMLCollection is an interface representing a generic collection of elements (in document order) and offers methods and properties for traversing the list.
MDN