Use the document.documentElement property in JavaScript to get the documentElement of the document i.e. the nodeName. You can try to run the following code to implement document.documentElement property in JavaScript −
Example
<!DOCTYPE html> <html> <head> <title>JavaScript Example</title> </head> <body> <p>Demo Text</p> <script> document.body.style.backgroundColor = "gray"; var a = document.documentElement.nodeName; document.write("Node Name: "+a); </script> </body> </html>