The Element.after() method inserts a set of Node or string objects in the children list of the Element's parent, just after the Element. String objects are inserted as equivalent Text nodes. 
 The Element.after() method inserts a set of Node or string objects in the children list of the Element's parent, just after the Element. String objects are inserted as equivalent Text nodes. 
js
after(node1) after(node1, node2) after(node1, node2, /* …, */ nodeN)
None (undefined).
HierarchyRequestError DOMException
Thrown when the node cannot be inserted at the specified point in the hierarchy.
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); let span = document.createElement("span"); p.after(span); console.log(container.outerHTML); // "<div><p></p><span></span></div>"
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); p.after("Text"); console.log(container.outerHTML); // "<div><p></p>Text</div>"
js
let container = document.createElement("div"); let p = document.createElement("p"); container.appendChild(p); let span = document.createElement("span"); p.after(span, "Text"); console.log(container.outerHTML); // "<div><p></p><span></span>Text</div>"
| 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 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/Element/after