HTML oncontextmenu Event Attribute - Playground Example

<!DOCTYPE html> 
  <html> 
    <head>
      <title>oncontextmenu event</title> 
    </head> 
    <body> 
    <div contextmenu="testmenu" oncontextmenu="testFunction()">Click on me with the right mouse button.
    <menu type="context" id="testmenu"> 
      <menuitem label="like"> </menuitem> 
      <menuitem label="dislike"> </menuitem> 
    </menu> 
    </div> 
<script> 
function testFunction () { 
  alert("EXAMPLE: You are invoking the context menu!"); 
} 
</script> 
  </body> 
</html>