> For the complete documentation index, see [llms.txt](https://yinglinhan.gitbook.io/framer-x-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yinglinhan.gitbook.io/framer-x-api/library-ku/scroll/sizing.md).

# Sizing

Scroll组件要求你把所有内容都放到其内部的的Frame元素中，然后计算你滚动产生的偏移量。为了能使它正常工作，它需要能计算内容的总的尺寸。

组件本身会利用ResizeObserver尝试去自动测量组件内的子元素的尺寸，如果它不可用，会有其他的替代方案。但是如果你使用contentwidth和contentHeight，它就会选择不用不去自动测量，如果你想提高滚动动画的性能，那么你可以选择这样做，避免了自动测量的造成的性能损耗。


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