Document.scrollingElement

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

scrollingElement（Document 的只读属性）返回滚动文档的 Element 对象的引用。在标准模式下，这是文档的根元素， document.documentElement。

当在怪异模式下，scrollingElement 属性返回 HTML body 元素（若不存在返回 null）。

var element = document.scrollingElement;

var scrollElm = document.scrollingElement;
scrollElm.scrollTop = 0;

Specification
CSSOM View Module # dom-document-scrollingelement

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