Check out example codes for "js remove all child elements from html". It will help you in understanding the concepts better.

Code Example 1

document.getElementById("myId").innerHTML = '';

Code Example 2

while (myNode.firstChild) {

Code Example 3

// Get the <ul> element with id="myList"
let list = document.getElementById("myList");

// As long as <ul> has a child node, remove it
while (list.hasChildNodes()) {  

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