Using document.append
The .append() method inserts a set of Node or string objects after the last child of the document. This can be used to add a new node or move an existing child node to a new position. The append() method does not return a value; its parameters are either Nodes or string objects.
Document: append() method
The Document.append() method
inserts a set of Node objects or string objects after
the last child of the document. String objects
are inserted as equivalent Text nodes.
This method appends a child to a Document. To append to an arbitrary element in the tree, see Element.append().
Syntax
append(param1) append(param1, param2) append(param1, param2, /* … ,*/ paramN)
Parameters
param1, …,paramN-
A set of
Nodeor string objects to insert.
Return value
None (undefined).
Exceptions
HierarchyRequestErrorDOMException-
Thrown when the node cannot be inserted at the specified point in the hierarchy.
Examples
Appending a root element to a document
If you try to append an element to an existing HTML document,
it might throw a HierarchyRequestError DOMException given a <html> element already exists.
let html = document.createElement("html");
document.append(html);
// HierarchyRequestError: The operation would yield an incorrect node tree.
If you are creating a new document without any existing element, you can append a root HTML element (or a root SVG element):
let doc = new Document();
let html = document.createElement("html");
doc.append(html);
doc.children; // HTMLCollection [<html>]
Source: Mozilla, https://developer.mozilla.org/en-US/docs/Web/API/Document/append
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