JS HTML
TARGET ELEMENT <p id="para">FOO</p>
GET HTML ELEMENT var p = document.getElementById("para"); REPLACE "FOO" WITH "DOO" p.innerHTML = "DOO"; TO APPEND p.innerHTML += "<strong>ZOO</strong>";
TARGET ELEMENT <p id="para">FOO</p>
CREATE NEW ELEMENT let s = document.createElement("strong"); stronk.innerHTML = "ZOO"; GET TARGET var p = document.getElementById("para"); APPEND NEW ELEMENT p.appendChild(s);