html

TEXT
<div id="div-01">Here is div-01</div>
TEXT2
<div id="div-02">Here is div-02</div>
<pre>Here is the result area</pre>

js

// Initially, set node to the Text node with `TEXT`
let node = document.getElementById("div-01").previousSibling;
let result = "Next element siblings of TEXT:\n";
while (node) {
  result += `${node.nodeName}\n`;
  node = node.nextElementSibling; // The first node is a CharacterData, the others Element objects
}
document.querySelector("pre").textContent = result;