CSS3 Animations are a new feature of modern browsers like Firefox, which add even more flexibility and control to the style and experience of the Web. CSS3 Animations let you change property values over time with no or minimal JavaScript, and with greater control than CSS Transitions. Go beyond static properties to animate the appearance and positions of HTML elements. You can achieve these effects without Flash or Silverlight, to make creative dynamic interfaces and engaging animations with CSS3.
CSS3 动画是像 Firefox 这样的现代浏览器的新特性，为网页的风格和体验提供了更多的灵活性和控制。CSS3 动画不需要  JavaScript 即可改变属性值，并对 CSS 的动画效果有更好的控制，使用更简单的参数来实现动画。你无需使用 Flash 或者 Silverlight 来实现这些效果，只需通过 CSS3 来实现动态交互和精美动画。