Element.nextElementSibling

The Element.nextElementSibling read-only property returns the element immediately following the specified one in its parent's children list, or null if the specified element is the last one in the list.

// Getter
element = el.nextElementSibling;

// No setter; read-only property

<div id="div-01">Here is div-01</div>
<div id="div-02">Here is div-02</div>

<script type="text/javascript">
  let el = document.getElementById('div-01').nextElementSibling;
  console.log('Siblings of div-01:');
  while (el) {
    console.log(el.nodeName);
    el = el.nextElementSibling;
  }
</script>

This example outputs the following into the console when it loads:

Siblings of div-01:
DIV
SCRIPT

• Element.previousElementSibling