Given an element:
<div id="elem" class="www"></div>
Check if this element is an element
with www class.
Given an element. Check if this element is a paragraph.
Given two variables elem1 and elem2
containing two elements:
<div id="elem1">
<p id="elem2"></p>
</div>
let elem1 = document.querySelector('#elem1');
let elem2 = document.querySelector('#elem2');
Check if an element from elem2 is a
child of an element from elem1.