The DocumentType.after() method inserts a set of Node objects or strings in the children list of the DocumentType's parent, just after the DocumentType. Strings are inserted as equivalent Text nodes. 
 The DocumentType.after() method inserts a set of Node objects or strings in the children list of the DocumentType's parent, just after the DocumentType. Strings are inserted as equivalent Text nodes. 
js
after(param1) after(param1, param2) after(param1, param2, /* …, */ paramN)
None (undefined).
HierarchyRequestError DOMException
Thrown when the node cannot be inserted at the specified point in the hierarchy.
js
let docType = document.implementation.createDocumentType("html", "", ""); let myDoc = document.implementation.createDocument("", "", docType); docType.after(document.createElement("html")); myDoc.childNodes; // NodeList [<!DOCTYPE html>, <html>]
| Specification | 
|---|
| DOM Standard  # ref-for-dom-childnode-after①  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
after | 
54 | 17 | 49 | No | 39 | 10 | 54 | 54 | 49 | 41 | 10 | 6.0 | 
    © 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
    https://developer.mozilla.org/en-US/docs/Web/API/DocumentType/after