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---
id: 5d822fd413a79914d39e98c9
title: Part 1
challengeType: 0
---
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# --description--
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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.
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# --hints--
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test-text
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```js
assert(code.match(/<!DOCTYPE \s+html \s*> /gi));
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```
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# --seed--
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## --seed-contents--
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```html
```
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# --solutions--
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```html
<!DOCTYPE html>
```