Can I use
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Scoped Styles: the @scope rule

- WD

Allows CSS rules to be scoped to part of the document, with upper and lower limits described by selectors.

Chrome

  1. ❌ 4 - 103: Not supported
  2. ❌ 104 - 117: Disabled by default
  3. ✅ 118 - 134: Supported
  4. ✅ 135: Supported
  5. ✅ 136 - 138: Supported

Edge

  1. ❌ 12 - 103: Not supported
  2. ❌ 104 - 117: Disabled by default
  3. ✅ 118 - 134: Supported
  4. ✅ 135: Supported

Safari

  1. ❌ 3.1 - 17.3: Not supported
  2. ✅ 17.4 - 18.3: Supported
  3. ✅ 18.4: Supported
  4. ✅ 18.5 - TP: Supported

Firefox

  1. ❌ 2 - 136: Not supported
  2. ❌ 137: Not supported
  3. ❌ 138 - 140: Not supported

Opera

  1. ❌ 9 - 89: Not supported
  2. ❌ 90 - 105: Disabled by default
  3. ✅ 106 - 116: Supported
  4. ✅ 117: Supported

IE

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

Chrome for Android

  1. ✅ 135: Supported

Safari on iOS

  1. ❌ 3.2 - 17.3: Not supported
  2. ✅ 17.4 - 18.3: Supported
  3. ✅ 18.4: Supported
  4. ✅ 18.5: Supported

Samsung Internet

  1. ❌ 4 - 24: Not supported
  2. ✅ 25 - 26: Supported
  3. ✅ 27: 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: Not supported

Android Browser

  1. ❌ 2.1 - 4.4.4: Not supported
  2. ✅ 135: Supported

Firefox for Android

  1. ❌ 137: Not supported

QQ Browser

  1. ❌ 14.9: Not supported

Baidu Browser

  1. ❌ 13.52: Not supported

KaiOS Browser

  1. ❌ 2.5: Not supported
  2. ❌ 3: Not supported

This implementation replaces an older concept of scoping CSS rules.

Resources:
Firefox support bug
Explainer
An introduction to @scope in CSS
WebKit position: support