Document: prepend() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
TheDocument.prepend() methodinserts a set ofNode objects or strings beforethe first child of the document. Stringsare inserted as equivalentText nodes.
This method prepends a child to aDocument. To prepend to an arbitrary element in the tree, seeElement.prepend().
Syntax
prepend(param1)prepend(param1, param2)prepend(param1, param2, /* …, */ paramN)Parameters
param1, …,paramNA set of
Nodeobjects or strings to insert.
Return value
None (undefined).
Exceptions
HierarchyRequestErrorDOMExceptionThrown 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 aHierarchyRequestErrorDOMException 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 # ref-for-dom-parentnode-prepend① |