JAVASCRIPT

onfocus js

const password = document.querySelector('input[type="password"]');

password.addEventListener('focus', (event) => {
  event.target.style.background = 'pink';
});

password.addEventListener('blur', (event) => {
  event.target.style.background = '';
});

window onfocus

window.onload = function() { 
    window.onfocus = function() { alert('example'); };
};