What is a child element?

Answer 1

nice explanation, Jack.
here is a demo as supplement :
https://code.sololearn.com/WZwQjTQzYrxe/?ref=app

Answer 2

A child element is anything that sits underneath another element but are related.
SO for example in HTML, you can have a div which is a container and anything inside the <div> tags will be a child element of the div
Example:
<div>
<p> This is a paragraph inside my div, as i am indented between 2 div tags, i am a child element of the div. </p>
</div>