{
  "title":"IntersectionObserver",
  "description":"API that can be used to understand the visibility and position of DOM elements relative to a containing element or to the top-level viewport. The position is delivered asynchronously and is useful for understanding the visibility of elements and implementing pre-loading and deferred loading of DOM content.",
  "spec":"https://wicg.github.io/IntersectionObserver/",
  "status":"unoff",
  "links":[
    {
      "url":"https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API",
      "title":"MDN article"
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    {
      "url":"https://github.com/jeremenichelli/intersection-observer-polyfill",
      "title":"Polyfill"
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    {
      "url":"https://developers.google.com/web/updates/2016/04/intersectionobserver",
      "title":"Google Developers article"
    }
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  "bugs":[
    
  ],
  "categories":[
    "DOM",
    "JS API"
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  "notes":"",
  "notes_by_num":{
    "1":"Enabled in Firefox by setting the `about:config` preference `dom.IntersectionObserver.enabled` to true"
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  "keywords":"",
  "ie_id":"intersectionobserver",
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  "webkit_id":"specification-intersection-observer",
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}