html child of element code example

Example 1: javascript get 2nd child element

//you can use the css nth-child property like this:
var second-child = document.querySeletorAll('[your element name]:nth-child(2)');

Example 2: javascript get child by name

let myForm = document.getElementById('form');

let child = myForm.querySelector('input[name="username"]');

console.log(child);