{
  "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://www.w3.org/TR/intersection-observer/",
  "status":"wd",
  "links":[
    {
      "url":"https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API",
      "title":"MDN Web Docs - Intersection Observer"
    },
    {
      "url":"https://github.com/w3c/IntersectionObserver/tree/master/polyfill",
      "title":"Polyfill"
    },
    {
      "url":"https://developers.google.com/web/updates/2016/04/intersectionobserver",
      "title":"Google Developers article"
    }
  ],
  "bugs":[
    {
      "description":"[Chromium](https://bugs.chromium.org/p/chromium/issues/detail?id=833725): In a background tab, IntersectionObserver does not trigger its callback."
    }
  ],
  "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",
    "2":"\"Preliminary\" support as feature is still in development",
    "3":"`isIntersecting` property of `IntersectionObserverEntry` was not implemented, returning `undefined`",
    "4":"IntersectionObserver does not trigger its callback in a Chrome background tab"
  },
  "usage_perc_y":85.38,
  "usage_perc_a":3.92,
  "ucprefix":false,
  "parent":"",
  "keywords":"",
  "ie_id":"intersectionobserver",
  "chrome_id":"5695342691483648",
  "firefox_id":"intersection-observer",
  "webkit_id":"specification-intersection-observer",
  "shown":true
}