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<!DOCTYPE html> <html> <head> <title>How to get class name by ID javascript</title> </head> <body> <ul> <li id="myId" class="myClass">Item one</li> </ul> <button onclick="myFunction()">Click me</button> <script> function myFunction() { var li = document.getElementById('myId'); alert(li.className); } </script> </body> </html>