IntersectionObserver

- WD

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.

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 14: Not supported
  2. 15: Partial support
  3. 16 - 18: Supported
  4. 79: Supported
  5. 80: Supported

Firefox

  1. 2 - 51: Not supported
  2. 52 - 54: Disabled by default
  3. 55 - 72: Supported
  4. 73: Supported
  5. 74 - 75: Supported

Chrome

  1. 4 - 50: Not supported
  2. 51 - 57: Partial support
  3. 58 - 64: Supported
  4. 65 - 79: Supported
  5. 80: Supported
  6. 81 - 83: Supported

Safari

  1. 3.1 - 12: Not supported
  2. 12.1: Supported
  3. 13: Supported
  4. TP: Supported

Opera

  1. 9 - 37: Not supported
  2. 38 - 44: Partial support
  3. 45 - 63: Supported
  4. 64 - 65: Supported
  5. 66: Supported

iOS Safari

  1. 3.2 - 12.1: Not supported
  2. 12.2 - 13.1: Supported
  3. 13.2: Supported
  4. 13.3: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 80: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Supported

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Partial support

Samsung Internet

  1. 4: Not supported
  2. 5 - 6.4: Partial support
  3. 7.2 - 9.2: Supported
  4. 10.1: Supported

QQ Browser

  1. 1.2: Not supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
MDN Web Docs - Intersection Observer
Google Developers article
Polyfill
Sub-features:
IntersectionObserver V2