freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-001.md

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---
id: 5d822fd413a79914d39e98c9
title: Part 1
challengeType: 0
dashedName: part-1
---
# --description--
Welcome to the CSS Variables skyline project! Start by adding the `!DOCTYPE html` declaration at the top of the document so the browser knows what type of document it's reading.
# --hints--
test-text
```js
assert(code.match(/<!DOCTYPE\s+html\s*>/gi));
```
# --seed--
## --seed-contents--
```html
```
# --solutions--
```html
<!DOCTYPE html>
```