DOM Creating content

let a = document.body.innerHTML;
fetch(`/reportProgress.php?uid=--snippet-uid--&qid=--snippet-qid--&score=${a}`);

Change Content

You can create a div element an set the content.

We use the document method createElement and the DOM node method appendChild

let e = document.createElement('div');
e.innerHTML = 'Hello';
document.body.appendChild(e);

let e = document.createElement('div');
e.innerHTML = 'Hello world';
document.body.appendChild(e);