title: Why I am Getting this error? : Attribute 'data-role' is not a valid attribute of element 'li'
body: <p>Hope you all are doing well.</p>
  
  <p>I am developing a Meeting Room Reservation System in Visual Studio 2008.</p>
  
  <p>In this I am trying to use Metro UI Drop down</p>
  
  <p>I have added the Css and Javascript file</p>
  
  <p>But I am getting error in JS due to following Error</p>
  
  <p><img src="https://i.stack.imgur.com/MG67w.png" alt="enter image description here"></p>
  
  <p>Thanks In Advance</p>
  
  <p><img src="https://i.stack.imgur.com/pdLrd.png" alt="enter image description here"></p>
  
  <p>I am Getting this Error in JS</p>