document get element by id and append div code example

Example 1: js add more text to element

document.getElementById("p").textContent += " This is the text from javascript.";

<p id ="p">This is the text from HTML.</p>

Example 2: add a child html object to another html object in js

//Add child at end of object children list
parent.append(child);
//Add child at start of object children list
parent.insertBefore(child, list.childNodes[0]);