Ja, damit hatte ich's dann auch gelöst: ~~~JavaScript getModalContent() { return new Promise((resolve, reject) => { if (this.modalContentUrl) { const [contentUrl, contentSelector] = this.modalContentUrl.split(/\s/); addClass(this.elements.self, this.modalContentLoadingClass); const ajax = new XMLHttpRequest(); ajax.open('GET', contentUrl, true); ajax.send(); ajax.onload = () => { if (ajax.status === 200) { if (contentSelector) { const contentElement = new DOMParser() .parseFromString(ajax.responseText, 'text/html') .querySelector(contentSelector); this.elements.body.innerHTML = ''; this.elements.body.appendChild(contentElement); this.contentElement = contentElement; } else { this.elements.section.innerHTML = ajax.responseText; } // history.pushState({ url: contentUrl }, null, contentUrl); resolve(ajax.status); } else { reject(ajax.status); } }; ajax.ontimeout = () => { reject(ajax.timeout); }; } else { resolve(true); } }); } ~~~

Ja, damit hatte ich's dann auch gelöst: ~~~JavaScript getModalContent() { return new Promise((resolve, reject) => { if (this.modalContentUrl) { const [contentUrl, contentSelector] = this.modalContentUrl.split(/\s/); addClass(this.elements.self, this.modalContentLoadingClass); const ajax = new XMLHttpRequest(); ajax.open('GET', contentUrl, true); ajax.send(); ajax.onload = () => { if (ajax.status === 200) { if (contentSelector) { const contentElement = new DOMParser() .parseFromString(ajax.responseText, 'text/html') .querySelector(contentSelector); this.elements.body.innerHTML = ''; this.elements.body.appendChild(contentElement); this.contentElement = contentElement; } else { this.elements.section.innerHTML = ajax.responseText; } resolve(ajax.status); } else { reject(ajax.status); } }; ajax.ontimeout = () => { reject(ajax.timeout); }; } else { resolve(true); } }); } ~~~