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---
id: 5d822fd413a79914d39e98c9
title: Part 1
challengeType: 0
---
## Description
<section id='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.
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: test-text
testString: assert(code.match(/<!DOCTYPE\s+html\s*>/gi));
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```html
```
</div>
</section>
## Solution
<section id='solution'>
```html
<!DOCTYPE html>
```
</section>