Saturday, November 1, 2008

Introducing Compass.

Pointing the way to cleaner, more maintainable stylesheets.

Are you stuck in a web of CSS Spaghetti? Are you tired of starting from scratch with every website that you build? Don't designers deserve tools to create abstractions just like their programmer buddies? With compass you start with a vocabulary of common styling patterns and best practices all wrapped up and ready to go. With Compass, you don't write CSS! CSS was designed to make browsers efficient, not designers. Instead you write your stylesheets in a language called Sass and it gets converted to CSS for you. But don't let this frighten you. Sass was designed to make CSS easier. So let's start with a really simple example. Ever wanted a list that was displayed horizontally instead of vertically? I thought so. In fact, you probably have a css class tucked away somewhere called "horizontal" that you can apply to lists to achieve this effect. If you do, you've created an abstraction that you can apply to your html to achieve a desired presentation. This is practical and I understand why you've done this but that doesn't change the fact that you're doing it WRONG! You've heard the CSS Experts talk about writing "Semantic" HTML and how you should keep your content and styles separate. But the power of abstraction to simplify your immediate task at hand always trumps the theoretical benefit of "doing it right." Using Compass and Sass, you no longer have to make this trade-off -- Doing the right thing now is just as easy as doing the wrong thing was. So instead of doing this: You can omit the non-semantic "horizontal" class and just add this to your stylesheet instead: +horizontal-list is called a "Mixin". It adds a behavior to the "ol#menu" selector. A mixin can add styles and nested rules. So the above code generates the following CSS: Aren't you glad you didn't have to write all that by hand?

Why does semantic markup matter?

I'll direct you to a page on my website and point out that there's three menus on this page. There's a top menu for general navigation, a context menu on the left side, and a footer menu. Each of them looks completely different and yet the same code was used to generate the html for each one. The only difference is how they are styled. Certainly doable without Compass, but because our abstractions live in the stylesheets, it was no harder than styling custom generated html for each with the corresponding utility class names in the html markup.

We've only scratched the surface.

There are about twenty utility mixins (and growing) found in compass to make the things you do every day as a designer easier. But compass is much more than a collection of utilities. Compass contains a complete port of the Blueprint CSS Framework. And if that's not enough, Compass is designed to work with other CSS frameworks as well and it will even let you mix and match them. For instance, at we use YUI's font system and base styles but Blueprint's grid system.

Are you ready to get started?

It's time to read the Compass Primer. You can also head over to the wiki and read the Getting Started page.

Don't forget

Please follow the Compass project on github to stay up to date on developments and join the Mailing list for major announcements and support. For now, please report any bugs you find to the mailing list.

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