Function: insertBefore()

function insertBefore<T>(newNode, referenceNode): T;

Inserts a node before a reference node.

Type Parameters

Type Parameter
T extends Node

Parameters

Parameter	Type	Description
newNode	T	The node to insert.
referenceNode	Node	The reference node.

Returns

T

The inserted node.

Example

const parent = document.createElement('div')
const a = document.createElement('span')
const b = document.createElement('span')
parent.appendChild(a)
insertBefore(b, a)
parent.children.length // => 2

Since

1.0.0