https://adambaney.com/wp-content/plugins/focus/js/preload.js?ver=4.8

1/*
2Document Name:     preload.js
3Document Purpose:  Page preload indicator
4Document Version:  4.8
5*/
6
7jQuery.noConflict();
8
9jQuery(function() {
10    //  Add Preloader after <body>
11    //jQuery('body').prepend('<div id="preloader"><div class="preload-icon"></div></div>'); // Added in core plugin file instead...works better
12    //jQuery('body').addClass('body-overflow'); // keep page from scrolling during load
13    jQuery('body').css('overflow','hidden');
14});
15
16jQuery(window).load(function() {
17    jQuery(document).ready(function() {
18        focus_preloader();
19    });
20});
21function focus_preloader() {
22    jQuery('.preload-icon').delay(500).fadeOut(700);
23    jQuery('#preloader').delay(700).fadeOut(700);
24    //jQuery('body').delay(1000).removeClass('body-overflow');
25    jQuery('body').css('overflow','');
26}