Mouse Gradient JS Advanced

function attachGradientEvents() {
    function attachGradientEvents() {
        let gradient = document.getElementById('gradient');

        gradient.addEventListener('mousemove', gradientMove);
        gradient.addEventListener('mouseout', gradientOut);

        function gradientMove(event) {
            let power = event.offsetX / (event.target.clientWidth - 1);
            power = Math.trunc(power * 100);
            document.getElementById('result').textContent = power + "%";
        }

        function gradientOut(event) {
            document.getElementById('result').textContent = "";
        }
    };
}