HTML Imports

- WD

Deprecated method of including and reusing HTML documents in other HTML documents. Superseded by ES modules.

Chrome

  1. 4 - 29: Not supported
  2. 30 - 34: Disabled by default
  3. 35: Disabled by default
  4. 36 - 79: Supported
  5. 80 - 104: Not supported
  6. 105: Not supported
  7. 106 - 108: Not supported

Edge

  1. 12 - 18: Not supported (but has polyfill available)
  2. 79: Supported
  3. 80 - 104: Not supported
  4. 105: Not supported

Safari

  1. 3.1 - 5.1: Not supported
  2. 6 - 15.6: Not supported (but has polyfill available)
  3. 16.0: Not supported (but has polyfill available)
  4. 16.1 - TP: Not supported (but has polyfill available)

Firefox

  1. 2 - 29: Not supported
  2. 30 - 31: Not supported (but has polyfill available)
  3. 32 - 55: Disabled by default
  4. 56 - 104: Not supported (but has polyfill available)
  5. 105: Not supported (but has polyfill available)
  6. 106 - 107: Not supported (but has polyfill available)

Opera

  1. 9 - 16: Not supported
  2. 17 - 21: Disabled by default
  3. 22: Disabled by default
  4. 23 - 66: Supported
  5. 67 - 90: Not supported
  6. 91: Not supported

IE

  1. 5.5 - 9: Not supported
  2. 10: Not supported (but has polyfill available)
  3. 11: Not supported (but has polyfill available)

Chrome for Android

  1. 105: Not supported

Safari on iOS

  1. 3.2 - 6.1: Not supported
  2. 7 - 15.6: Not supported (but has polyfill available)
  3. 16.0: Not supported (but has polyfill available)
  4. 16.1: Not supported (but has polyfill available)

Samsung Internet

  1. 4 - 12.0: Supported
  2. 13.0 - 17.0: Not supported
  3. 18.0: Not supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 64: Not supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 105: Not supported

Firefox for Android

  1. 104: Not supported (but has polyfill available)

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Not supported

KaiOS Browser

  1. 2.5: Supported
Resources:
Firefox tracking bug: Implement HTML Imports
Chromium tracking bug: Implement HTML Imports
IE Web Platform Status and Roadmap: HTML Imports
HTML5Rocks - HTML Imports: #include for the web