AlgorithmsBrowser and DOMRuns in your browserReviewed October 1, 2026

DOM Traversal: Depth-First Search Visualizer

Walk the DOM tree by following one branch as deep as possible before backtracking. Interactive step-by-step animation with JavaScript code, complexity and front-end use cases.

Localprivate by defaultFastno sign-up path

Browser and DOMTime: O(n)Space: O(h) for tree height h

Find the first element named

html

head

title

body

header

nav

main

section

button

footer

Call stack (path from the root)

empty

Visit order

empty

Step 1 / 34

Depth-first search goes as deep as possible down one branch before trying the next, looking for <button>. It is how querySelector walks the DOM.

JavaScript

1function dfs(node, target, visit) {
2  visit(node);
3  if (node.tag === target) return node;
4  for (const child of node.children) {
5    const found = dfs(child, target, visit);
6    if (found) return found;
7  }
8  return null;
9}

Tip: use the arrow keys to step and the space bar to play or pause.

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DOM Traversal: Depth-First Search Visualization and Animation

Walk the DOM tree by following one branch as deep as possible before backtracking. Visit the current element. Recursively visit each child in order, going all the way down first. Backtrack up when a branch ends. Time complexity: O(n). Space complexity: O(h) for tree height h. querySelector, finding nested elements, copying or serializing a subtree and walking component trees.

How to use DOM Traversal: Depth-First Search Visualizer

Visit the current element.
Recursively visit each child in order, going all the way down first.
Backtrack up when a branch ends.
Press Play, or step through with the arrow buttons and change the input to see how it reacts.

Questions

What is DOM Traversal: Depth-First Search?

Walk the DOM tree by following one branch as deep as possible before backtracking.

What is the time complexity of DOM Traversal: Depth-First Search?

Time: O(n). Space: O(h) for tree height h.

Where do front-end developers use DOM Traversal: Depth-First Search?

querySelector, finding nested elements, copying or serializing a subtree and walking component trees.

Does this upload my data?

No. This converter runs in your browser for ordinary use, so the input is not sent to a backend by this tool.

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