The Document.prepend() method inserts a set of Node objects or string objects before the first child of the document. String 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().
js
prepend(param1)
prepend(param1, param2)
prepend(param1, param2, /* …, */ paramN)
None (undefined).
HierarchyRequestError DOMException
Thrown when the node cannot be inserted at the specified point in the hierarchy.
If you try to prepend an element to an existing HTML document, it might throw a `HierarchyRequestError' DOMException given a <html> element already exists.
js
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):
js
let doc = new Document();
let html = document.createElement("html");
doc.prepend(html);
doc.children; // HTMLCollection [<html>]
| Specification |
|---|
| DOM Standard # ref-for-dom-parentnode-prepend① |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
prepend |
54 | 17 | 49 | No | 41 | 10 | 54 | 54 | 49 | 41 | 10 | 6.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/Document/prepend