https://grassgigs.com/bg-art-loader.js

1(function() {
2    var placeholder = document.getElementById('bg-art-placeholder');
3    if (!placeholder) {
4        // No placeholder found, insert at start of body
5        placeholder = document.createElement('div');
6        placeholder.id = 'bg-art-placeholder';
7        document.body.insertBefore(placeholder, document.body.firstChild);
8    }
9    fetch('/shared-bg-art.html')
10        .then(function(r) { return r.text(); })
11        .then(function(html) { placeholder.outerHTML = html; })
12        .catch(function() { /* silent fail - decorative only */ });
13})();