Since we want to do things as properly as possible, let's add a doctype and charset declaration.

```html
<!DOCTYPE html>
<html lang="en-us">

<head>
  <meta charset="utf-8">
  <title>...</title>
</head>
```

More info on stuff like this can be found at [HTML5 Boilerplate's docs](https://github.com/h5bp/html5-boilerplate/blob/master/doc/TOC.md).