-Showcasing patterns' front-end code leads to authors writing more consistent code, but that doesn't guarantee perfection. There's still room for developers to go rogue and write sloppy, incongruent code, which is why some organizations have gone above and beyond to establish incredibly sophisticated design systems. **Companies like Lonely Planet have achieved the Holy Grail of pattern libraries, which is to say their pattern library and production environment are perfectly in sync**. We'll discuss the Holy Grail in more detail in the next chapter, but it's worth brining up in this section to demonstrate how that affects the code exposed in the context of a pattern library. Rather than surfacing HTML and CSS, Lonely Planet's [Rizzo style guide](http://rizzo.lonelyplanet.com/) surfaces the include code for teams to pull in the appropriate UI component.
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