Given an item in the DOM, use querySelector() to identify it, like this:
const item = document.querySelector('#itemId')
then, to remove all its children elements, you have a few different solutions.
The fastest way looks like this:
item.innerHTML = ''
Another solution that is suggested is this: create a loop, check if the firstChild property is defined (the element has at least a child) and then remove it:
const item = document.querySelector('#itemId')
while (item.firstChild) {
item.removeChild(item.firstChild)
}
The loop ends when all children are removed.
The first, in most performance benchmarks I checked, looks like being the fastest solution.
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