Next Right Sibling

Question

Given a DOM tree and a target element, please return the next right sibling.

Like above, the next right sibling of <button/> is the blue <a/>. Notice that they don't necessarily have the same parent element.

If no right sibling, then return null.

What is time & space cost of your solution ?

Code

/**
 * @param {HTMLElement} root
 * @param {HTMLElement} target
 * @return {HTMLElemnt | null}
 */
function nextRightSibling(root, target) {
  // your code here
}

Source

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