關鍵不在硬件加速，而在於是否 reflow。

A reflow is a more significant change. This will happen whenever the DOM tree is manipulated, whenever a style is changed that affects the layout, whenever the className property of an element is changed, or whenever the browser window size is changed.

使用 margin/top 修改會觸發 reflow，拖慢速度。

Elements that are positioned absolutely or fixed, do not affect the layout of the main document, so if they reflow, they are the only thing that reflows. The document behind them will need to repaint to allow for any changes, but this is much less of a problem than an entire reflow.

absolute 和 fixed 的元素的 reflow 不會牽動整體，但依舊不如 transform 只需要 repaint。

而 translate 和 translate3d 的區別則在於硬件加速。

參考資料：https://dev.opera.com/articles/efficient-javascript/?page=3#reflow

translate3d能开启硬件加速，提升性能。

我记得移动端是不支持原生滚动的，也就是不支持overflow: scroll; 于是才有了iscroll这样的解决框架。不过最新的Safari开始支持了。具体你搜下到处都是，不列举了。

是性能问题，移动端的焦点图效果都是translate3d做的，那样运动效果更平滑，而不是一卡一卡的

overflow:hidden; 很多坑。。