Shadow DOM (V1)

- WD

Method of establishing and maintaining functional boundaries between DOM trees and how these trees interact with each other within a document, thus enabling better functional encapsulation within the DOM & CSS.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79: Supported
  3. 80: Supported

Firefox

  1. 2 - 57: Not supported
  2. 58: Disabled by default
  3. 59 - 62: Disabled by default
  4. 63 - 72: Supported
  5. 73: Supported
  6. 74 - 75: Supported

Chrome

  1. 4 - 52: Not supported
  2. 53 - 79: Supported
  3. 80: Supported
  4. 81 - 83: Supported

Safari

  1. 3.1 - 9.1: Not supported
  2. 10 - 12.1: Partial support
  3. 13: Partial support
  4. TP: Partial support

Opera

  1. 9 - 39: Not supported
  2. 40 - 65: Supported
  3. 66: Supported

iOS Safari

  1. 3.2 - 9.3: Not supported
  2. 10 - 13.1: Partial support
  3. 13.2: Partial support
  4. 13.3: Partial support

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: Supported

Samsung Internet

  1. 4: Not supported
  2. 5: Partial support
  3. 6.2 - 9.2: Supported
  4. 10.1: Supported

QQ Browser

  1. 1.2: Supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
Safari implementation bug
Firefox implementation bug
Google Developers - Shadow DOM v1: self-contained web components