---
id: 5d822fd413a79914d39e9921
title: Step 88
challengeType: 0
dashedName: step-88
---
# --description--
For the next building, nest four `div` elements within `.fb3` with classes of `fb3a`, `fb3b`, `fb3a` again, and `fb3b` again, in that order. This building will have four sections, and the top two will be almost the same as the bottom two.
# --hints--
You should add four `div` elements within `.fb3`.
```js
assert.equal(document.querySelectorAll("div.fb3 > div")?.length, 4);
```
You should give the first new `div` a class of `fb3a`.
```js
assert.equal(document.querySelector("div.fb3").firstElementChild, document.querySelector("div.fb3a"));
```
You should give the second new `div` a class of `fb3b`.
```js
assert.equal(document.querySelector("div.fb3 :nth-child(2)"), document.querySelector("div.fb3b"));
```
You should give the third new `div` a class of `fb3a`.
```js
assert.equal(document.querySelector("div.fb3 :nth-child(3)"), document.querySelector("div.fb3b + div.fb3a"));
```
You should give the fourth new `div` a class of `fb3b`.
```js
assert.exists(document.querySelector("div.fb3 :nth-child(4).fb3b"));
```
# --seed--
## --seed-contents--
```html