.el.insertBefore code example
Example 1: js insertbefore
// The Node.insertBefore() method inserts a node before a
// reference node as a child of a specified parent node.
let insertedNode = parentNode.insertBefore(newNode, referenceNode)
Example 2: javascript insertBefore
<div id="parentElement">
<span id="childElement">foo bar</span>
</div>
<script>
// Create a new, plain <span> element
let sp1 = document.createElement("span")
// Get the reference element
let sp2 = document.getElementById("childElement")
// Get the parent element
let parentDiv = sp2.parentNode
// Insert the new element into before sp2
parentDiv.insertBefore(sp1, sp2)
</script>