Differences between tagname and nodename

The tagname and nodename have the same semantics and both return the names of the included tags. For example, the above H2 tags all return H2, but tagname can only be used on element tags, nodename can be used on all nodes. The values of nodename on different nodes are as follows:

Interface	Nodename	Nodevalue	Attributes
ATTR	Name of attribute	Value of attribute	Null
Cdatasection	# CDATA-Section	Content of the CDATA section	Null
Comment	# Comment	Content of the comment	Null
Document	# Document	Null	Null
Documentfragment	# Document-Fragment	Null	Null
Documenttype	Document Type name	Null	Null
Element	Tag Name	Null	Namednodemap
Entity	Entity name	Null	Null
Entityreference	Name of entity referenced	Null	Null
Notation	Notation name	Null	Null
Processinginstruction	Target	Entire content excluding the target	Null
Text	# Text	Content of the text node	Null

Tagname has a value only on the element node.

From the DOM level, nodename is the property on the node interface, while tagname is the property on the element interface. All nodes (12 types of element nodes, attribute nodes, and text nodes) only the Element Node inherits the element node. Therefore, nodename has a larger scope of use than tagname.

Conclusion: tagname can only be used on element nodes, while nodename can be used on any node. It can be said that nodename covers tagname and has more functions. Therefore, we recommend that you always use nodename.

Differences between tagname and nodename