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intersection-observer-polyfill

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Polyfill for native IntersectionObserver API

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## Intersection Observer Polyfill

**IMPORTANT:** I'm not going to work on this polyfill since the WICG repository contains another one closest and more up-to-date according to the officla spec. I recommend using that one: https://github.com/w3c/IntersectionObserver/tree/master/polyfill

The IntersectionObserver API allows the developer to detect the intersection between a DOM elements and a reference element or the viewport.

**_BEWARE! This is still under development and doesn't cover all possible uses. Feel free to contribute!_**

You can see it working in [this sample page][3] built by [Wilson Page][1].

For more insight read [the official WICG draft][2].

### Contributing

Read the draft, fork this repo and help... there's a lot of stuff to do here yet:

- Support **rootMargin** in options
- Add support for intersection ratio under **threshold** option
- Add proper **this** context inside callback exposing **root** and **rootMargin** observer
- Support **root** element different from viewport
- ~~Support **unobserve** method~~
- ~~Support **disconnect** method~~
- Support **takeRecords** method
- Complete properties present in callback's context argument
  - ~~boundingClientRect~~
  - intersectionRect
  - rootBounds
  - ~~target~~
  - ~~time~~
- Support horizontal scrolling detection
- Improve frame rate performance on scroll
- Create sample page for root different for viewport case

### Browser support

This polyfill was tested in:

- **Chrome 49**
- **Chrome Mobile 49**
- **Firefox 45**
- **Safari 9**
- **iOS Safari 9**
- **Microsoft Edge**

[1]: https://github.com/wilsonpage
[2]: https://wicg.github.io/IntersectionObserver/
[3]: https://jeremenichelli.github.io/intersection-observer-polyfill/example

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