Can I use
?

Declarative Shadow DOM

- LS

Proposal to allow rendering elements with shadow dom (aka web components) using server-side rendering.

Chrome

  1. 4 - 84: Not supported
  2. 85 - 89: Disabled by default
  3. 90 - 110: Partial support
  4. 111 - 123: Supported
  5. 124: Supported
  6. 125 - 127: Supported

Edge

  1. 12 - 90: Not supported
  2. 91 - 110: Partial support
  3. 111 - 122: Supported
  4. 123: Supported

Safari

  1. 3.1 - 16.3: Not supported
  2. 16.4 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5 - TP: Supported

Firefox

  1. 2 - 122: Not supported
  2. 123 - 124: Supported
  3. 125: Supported
  4. 126 - 128: Supported

Opera

  1. 9 - 76: Not supported
  2. 77 - 96: Partial support
  3. 97 - 108: Supported
  4. 109: Supported

IE

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

Chrome for Android

  1. 123: Supported

Safari on iOS

  1. 3.2 - 16.3: Not supported
  2. 16.4 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5: Supported

Samsung Internet

  1. 4 - 14.0: Not supported
  2. 15.0: Support unknown
  3. 16.0 - 21: Partial support
  4. 22 - 23: Supported
  5. 24: 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. 123: Supported

Firefox for Android

  1. 124: Supported

QQ Browser

  1. 14.9: Not supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Not supported
Resources:
WebKit support bug
Firefox implementation bug
Declarative Shadow DOM - web.dev article
A ponyfill of the Declarative Shadow DOM API