Document.prepend()

The Document.prepend() method inserts a set of Node objects or DOMString objects before the first child of the document. DOMString objects are inserted as equivalent Text nodes.

This method prepends a child to a Document. To prepend to an arbitrary element in the tree, see Element.prepend().

Syntax

prepend(...nodesOrDOMStrings)

Parameters

nodesOrDOMStrings

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

Prepending a root element to a document

If you try to prepend an element to an existing HTML document, it might throw a `HierarchyRequestError' DOMException given a <html> element already exists.

let html = document.createElement("html");
document.prepend(html);
// HierarchyRequestError: The operation would yield an incorrect node tree.

If you are creating a new document without any existing element, you can prepend a root HTML element (or a root SVG element):

let doc = new Document();
let html = document.createElement("html");
doc.prepend(html);

doc.children; // HTMLCollection [<html>]

Specifications

Specification
DOM Standard (DOM)
# ref-for-dom-parentnode-prependā‘ 

Browser compatibility

BCD tables only load in the browser

See also