DOM: .insertAdjacentElement

node.insertAdjacentElement(position, newEle)

Move node newEle to a position around node node.

It can insert {before, after} node as sibling, or as {first, last} child of node.

position is a string, and must be one of:

• "beforebegin" → Before node.
• "afterend" → After node.
• "afterbegin" → As first child of node.
• "beforeend" → As last child of node.

Return the element inserted, or null if failed.

// create your new node <p>Hi</p>
const y = document.createElement("p");
y.textContent = "hi hi hi hi hi hi hi";

// a existing node
const x = document.getElementsByTagName ('p')[0] ;

// insert after
x.insertAdjacentElement("afterend", y);

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