Setting innerHTML: Why won't it update the DOM?

Question

Wondering why I can\'t get document.getElementById(\"my_div\").innerHTML to update the DOM when I re-assign the variable. For example:

Answer 1

you need to reassign the element after setting innerHTML/outerHTML:

let indexInParent=[].slice.call(elem.parentElement.children).indexOf(elem);
elem.innerHTML=innerHTML;
elem=elem.parentElement.children[indexInParent];