Element.before()

The Element.before() method inserts a set of Node or DOMString objects in the children list of this Element's parent, just before this Element. DOMString objects are inserted as equivalent Text nodes.

Syntax

before(... nodes)

Parameters

nodes

A set of Node or DOMString objects to insert.

Exceptions

HierarchyRequestError DOMException

Thrown when the node cannot be inserted at the specified point in the hierarchy.

Examples

Inserting an element

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");

p.before(span);

console.log(container.outerHTML);
// "<div><span></span><p></p></div>"

Inserting text

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);

p.before("Text");

console.log(container.outerHTML);
// "<div>Text<p></p></div>"

Inserting an element and text

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");

p.before(span, "Text");

console.log(container.outerHTML);
// "<div><span></span>Text<p></p></div>"

Specifications

Specification
DOM Standard
# ref-for-dom-childnode-before①

Browser compatibility

BCD tables only load in the browser

See also