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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/before below:

Element: before() method - Web APIs

Baseline Widely available

The Element.before() method inserts a set of Node objects or strings in the children list of this Element's parent, just before this Element. Strings are inserted as equivalent Text nodes.

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

param1, …, paramN

A set of Node objects or strings to insert.

None (undefined).

HierarchyRequestError DOMException

Thrown when the node cannot be inserted at the specified point in the hierarchy.

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");

p.before(span);

console.log(container.outerHTML);
// "<div><span></span><p></p></div>"

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);

p.before("Text");

console.log(container.outerHTML);
// "<div>Text<p></p></div>"

let container = document.createElement("div");
let p = document.createElement("p");
container.appendChild(p);
let span = document.createElement("span");

p.before(span, "Text");

console.log(container.outerHTML);
// "<div><span></span>Text<p></p></div>"

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