The Wayback Machine - https://web.archive.org/web/20251230214818/https://caniuse.com/intersectionobserver
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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.

Chrome

  1. ❌ 4 - 50: Not supported
  2. ◐ 51 - 57: Partial support
  3. ✅ 58 - 64: Supported
  4. ✅ 65 - 142: Supported
  5. ✅ 143: Supported
  6. ✅ 144 - 146: Supported

Edge

  1. ❌ 12 - 14: Not supported
  2. ◐ 15: Partial support
  3. ✅ 16 - 18: Supported
  4. ✅ 79 - 142: Supported
  5. ✅ 143: Supported

Safari

  1. ❌ 3.1 - 12: Not supported
  2. ✅ 12.1 - 26.1: Supported
  3. ✅ 26.2: Supported
  4. ✅ 26.3 - TP: Supported

Firefox

  1. ❌ 2 - 51: Not supported
  2. ❌ 52 - 54: Disabled by default
  3. ✅ 55 - 145: Supported
  4. ✅ 146: Supported
  5. ✅ 147 - 149: Supported

Opera

  1. ❌ 9 - 37: Not supported
  2. ◐ 38 - 44: Partial support
  3. ✅ 45 - 63: Supported
  4. ✅ 64 - 124: Supported
  5. ✅ 125: Supported

IE

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

Chrome for Android

  1. ✅ 143: Supported

Safari on iOS

  1. ❌ 3.2 - 12.1: Not supported
  2. ✅ 12.2 - 26.1: Supported
  3. ✅ 26.2: Supported
  4. ✅ 26.3: Supported

Samsung Internet

  1. ❌ 4: Not supported
  2. ◐ 5 - 6.4: Partial support
  3. ✅ 7.2 - 28: Supported
  4. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ❌ 2.1 - 4.4.4: Not supported
  2. ✅ 143: Supported

Firefox for Android

  1. ✅ 146: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ❌ 2.5: Not supported
  2. ✅ 3: Supported
Resources:
MDN Web Docs - Intersection Observer
Google Developers article
Polyfill
Sub-features:
IntersectionObserver V2