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 Superseded by ES modules.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 - 125: Not supported
  6. 126: Not supported
  7. 127 - 129: Not supported

Edge

  1. 12 - 18: Not supported (but has polyfill available)
  2. 79: Supported
  3. 80 - 125: Not supported
  4. 126: Not supported

Safari

  1. 3.1 - 5.1: Not supported
  2. 6 - 17.4: Not supported (but has polyfill available)
  3. 17.5: Not supported (but has polyfill available)
  4. 17.6 - 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 - 127: Not supported (but has polyfill available)
  5. 128: Not supported (but has polyfill available)
  6. 129 - 131: 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 - 110: Not supported
  6. 111: 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. 126: Not supported

Safari on iOS

  1. 3.2 - 6.1: Not supported
  2. 7 - 17.4: Not supported (but has polyfill available)
  3. 17.5: Not supported (but has polyfill available)
  4. 17.6 - 18.0: Not supported (but has polyfill available)

Samsung Internet

  1. 4 - 12.0: Supported
  2. 13.0 - 24: Not supported
  3. 25: 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: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 126: Not supported

Firefox for Android

  1. 127: Not supported (but has polyfill available)

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Not supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Not supported (but has polyfill available)
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