Window load function does not work on Safari

Question

When using Safari (Version 11.1 (13605.1.33.1.4)) every window event functions that I have tried are not working:

Pure JavaScript:
window.addEventListener('load', function() { // code here });
window.onload = function() { // code here };

jQuery
$(window).on('load', function() { // code here });
$(window).load(function() { // code here });

I don't want to use document ready functions, because I have to wait till all images are loaded on the page. If you have something other in mind, please feel free to discuss.

Answer 1

How about this?

if (document.readyState === 'complete') {
  callback();
} else {
  window.addEventListener('load', callback);
}