JAVASCRIPT

how to insert html in javascript

var h = document.getElementById("myH2");
h.insertAdjacentHTML("afterend", "<p>My new paragraph</p>"); 

how to insert html into javascript

let target = document.getElementById("ID");
target.innerHTML += "<p>CONTENTS</p>";

add new html from javascript

//add new created html : where to insert, what to insert
element.insertAdjacentHTML("afterbegin", html);