add_action('login_head', 'wpe_custom_login_scripts', 1);

function wpe_custom_login_scripts()

{

	echo '<script>

        document.addEventListener("DOMContentLoaded", function(event) { 

​

			//Add Placeholder

            document.getElementById("user_login").setAttribute( "placeholder", "username" );

			document.getElementById("user_pass").setAttribute( "placeholder", "password" );

			//Remove the labels

			var input = document.querySelectorAll(".forgetmenot input")[0];

            var label = document.querySelectorAll(".forgetmenot label")[0]; 

            var text = document.querySelectorAll(".forgetmenot label")[0].innerHTML.replace(/<[^>]*>/g, "");

​

            label.innerHTML = "";

            label.appendChild(input); ;

            label.innerHTML += "<strong>"+ text +"</strong>";

            labels = document.querySelectorAll("label");

            for (var i = labels.length - 1; i >= 0; i--)

            {

                var child = labels[i].firstChild, nextSibling;

​

                while (child) {

                    nextSibling = child.nextSibling;

                    if (child.nodeType == 3) {

                        child.parentNode.removeChild(child);

                    }

                    child = nextSibling;

                }

            }

        });

    </script>';

​

}