## Capitalization in HTML and CSS should always match
It's important that when you write CSS selectors using classes, IDs, and attributes
(keeping in mind that we should _never_ use IDs and attributes in our selectors), that the
capitalization in the CSS matches that used in the HTML. [HTML and CSS follow different case sensitivity rules](http://reference.sitepoint.com/css/casesensitivity), and we can avoid subtle gotchas by ensuring we use the
The closing bracket should be on its own line. This allows attributes to be shuffled and edited without having to move the bracket around. It also makes it easier to scan vertically and match opening and closing brackets. This format
is inspired by the positioning of the opening and closing parentheses in [Pug/Jade](https://pugjs.org/language/attributes.html#multiline-attributes).