Can I use
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Shadow DOM (deprecated V0 spec)

- UNOFF

Original V0 version of the Shadow DOM specification. See Shadow DOM V1 for support for the latest version.

Chrome

  1. ❌ 4 - 24: Not supported
  2. ✅ 25 - 34: Supported
  3. ✅ 35 - 79: Supported
  4. ❌ 80 - 136: Not supported
  5. ❌ 137: Not supported
  6. ❌ 138 - 140: Not supported

Edge

  1. ❌ 12 - 18: Not supported
  2. ✅ 79: Supported
  3. ❌ 80 - 136: Not supported
  4. ❌ 137: Not supported

Safari

  1. ❌ 3.1 - 18.4: Not supported
  2. ❌ 18.5: Not supported
  3. ❌ 26.0 - TP: Not supported

Firefox

  1. ❌ 2 - 28: Not supported
  2. ❌ 29 - 60: Disabled by default
  3. ❌ 61 - 138: Not supported
  4. ❌ 139: Not supported
  5. ❌ 140 - 142: Not supported

Opera

  1. ❌ 9 - 12.1: Not supported
  2. ✅ 15 - 21: Supported
  3. ✅ 22 - 66: Supported
  4. ❌ 67 - 116: Not supported
  5. ❌ 117: Not supported

IE

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

Chrome for Android

  1. ❌ 137: Not supported

Safari on iOS

  1. ❌ 3.2 - 18.4: Not supported
  2. ❌ 18.5: Not supported
  3. ❌ 26.0: Not supported

Samsung Internet

  1. ✅ 4: Supported
  2. ✅ 5 - 12.0: Supported
  3. ❌ 13.0 - 27: Not supported
  4. ❌ 28: Not supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

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

UC Browser for Android

  1. ❌ 15.5: Not supported

Android Browser

  1. ❌ 2.1 - 4.3: Not supported
  2. ✅ 4.4 - 4.4.4: Supported
  3. ❌ 137: Not supported

Firefox for Android

  1. ❌ 139: Not supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ❌ 13.52: Not supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ❌ 3: Not supported
Resources:
Safari implementation bug
Firefox implementation bug
Google Developers - Shadow DOM v1: self-contained web components
HTML5Rocks - Shadow DOM 101 article