本内容遵循CC 4.0 BY-SA版权协议 在过去十余年的前端开发中，只要产品经理或设计师提出“想要一个跟随页面滚动的阅读进度条”或者“想要一个具有多图层景深视差（Parallax Scrolling）的科技感首屏”，前端工程师就不得不写下一套沉重而脆弱的 JavaScript 脚本。

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Web Animations API（简称 WAAPI） 是完美缝合这两种机制的原生标准。它既拥有 CSS 动画直达 GPU 合成器的极高执行效率，又赋予了开发者如同在数字音频工作站（DAW）里操作时间线一样的命令式控制力——尤其是 动态调整播放速率（playbackRate）、瞬时对齐时间戳（currentTime）、以及动态热替换关键帧。

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