*[2010-Native HTML5 Drag and Drop](https://www.html5rocks.com/en/tutorials/dnd/basics/): Drag and drop (DnD) is a first class citizen in HTML5! The spec defines an event-based mechanism, JavaScript API, and additional markup for declaring that just about any type of element be draggable on a page.
# Scroll: 滚动事件
# Scroll & Visibility: 滚动事件与可见性
*[Complexities of an Infinite Scroller](https://developers.google.com/web/updates/2016/07/infinite-scroller)
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## IntersectionObserver
-[2018-Now You See Me: How To Defer, Lazy-Load And Act With IntersectionObserver](https://parg.co/Uiu): In this article, we are going to go out of the scroll darkness and talk about the modern way of lazy-loading resources.
## ScrollSpy: 滚动监听
*[React Visibility Sensor #Project#](https://github.com/joshwnj/react-visibility-sensor): Sensor component for React that notifies you when it goes in or out of the window viewport.
