Answers for "js select element child with class"

javascript get child element by class

// get child element of #test with class my-class
var testContainer = document.querySelector('#test');
var childNodeByClass = testContainer.querySelector('.my-class');

javascript child element selector

// given html
    <div class="parent">
        <div class="child1">
            <div class="child2">
            </div>
        </div>
    </div>
    
// Get parent
let parent = document.querySelector('.parent'); 
// child element selector
parent.querySelector('.child')