MutationObserver disconnect() schlägt fehl.

[Raik]

Danke!

Lösung 1 wäre also:

(function() {
    'use strict';
    const observer = new MutationObserver(function(mutations) {});
    observer.observe(document.documentElement, {childList: true, subtree: true});
    window.addEventListener('DOMContentLoaded', (event) => {observer.disconnect()})
})();

und Lösung 2:

(function() {
    'use strict';
    const observer = new MutationObserver(function(mutations) {
    if (document.readyState == "complete"){this.disconnect();}
    });
    observer.observe(document.documentElement, {childList: true, subtree: true});
})();