var pwdButton = document.getElementById("pwd-button");

var pwdInput = document.getElementById("pwd");

​

pwdButton.addEventListener("click", togglePasswordVisibility);

​

function togglePasswordVisibility(e){

  var hidden = (pwd.type === "password"); 

      //fetch current state

  hidden = !hidden; //toggle

  pwdButton.textContent = hidden?

    "Show password text" :

    "Hide password text" ;

  pwdInput.type = hidden?

    "password" :

    "text" ;

  pwdInput.setAttribute("aria-label", hidden?

    "Password" :

    "Password (shown)"

                       );

}