#486 Find Corresponding Node

Given two identical DOM trees A and B, and an element a in tree A, find the corresponding element b in tree B that has the same relative position.

Requirements

• Same structure – both DOM trees have identical structure.
• Relative position – elements at the same path from root should correspond.
• Multiple approaches – solve recursively, iteratively, and using DOM APIs.

Example

<!-- Tree A -->
<div id="rootA">
  <div class="container">
    <p class="text">Hello</p>
    <span class="highlight">World</span>
  </div>
</div>

<!-- Tree B -->
<div id="rootB">
  <div class="container">
    <p class="text">Goodbye</p>
    <span class="highlight">Universe</span>
  </div>
</div>

If a is the <p class="text"> element in tree A, then b should be the <p class="text"> element in tree B.

Signature

function findCorrespondingNode(rootA: Node, rootB: Node, target: Node): Node | null;

Follow-up Questions

1. Recursive vs Iterative – Can you solve this both ways?
2. DOM API optimization – Are there special DOM APIs for better performance?
3. Time complexity – What's the time cost for each approach?