Document: append() method

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• Syntax
• Parameters
• Return value
• Exceptions
• Examples
• Appending a root element to a document
• Specifications
• Browser compatibility
• See also

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The Document.append() method inserts a set of Node objects or strings after the last child of the document. Strings are inserted as equivalent Text nodes.

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

Syntax

append(param1)
append(param1, param2)
append(param1, param2, /* …, */ paramN)

Parameters

• param1, …, paramN
  • : A set of Node objects or strings to insert.

Return value

None (undefined).

Exceptions

• HierarchyRequestError DOMException
  • : Thrown when the node cannot be inserted at the specified point in the hierarchy.

Examples

Appending a root element to a document

If you try to append 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.append(html);
// HierarchyRequestError: The operation would yield an incorrect node tree.

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

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

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

Specifications

Browser compatibility

See also

• Document.prepend()
• Element.append()