UI is the vocabulary of the web. Semantic empowers designers and developers by creating a language for sharing UI. Lose the Hieroglyphics: Semantic is structured around natural language conventions to make development more intuitive. Have a conversation with your components: Semantic gives you a variety of UI components with real-time debug output, letting your code tell you what its doing.
![Front-end CSS Frameworks](https://cdn-ak-scissors.b.st-hatena.com/image/square/6842d8aceab87e13764e8e9ff1e1d5e7c45a4cd7/height=288;version=1;width=512/http%3A%2F%2Fusablica.github.com%2Ffront-end-frameworks%2Fimages%2Fcss-frameworks.png)