Custom Elements (V1)

- LS

Method of defining new HTML tags.

IE

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

Edge

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

Firefox

  1. 2 - 29: Not supported
  2. 30 - 49: Not supported (but has polyfill available)
  3. 50 - 58: Disabled by default
  4. 59 - 62: Disabled by default
  5. 63 - 72: Supported
  6. 73: Supported
  7. 74 - 75: Supported

Chrome

  1. 4 - 51: Not supported
  2. 52 - 53: Not supported (but has polyfill available)
  3. 54 - 66: Partial support
  4. 67 - 79: Supported
  5. 80: Supported
  6. 81 - 83: Supported

Safari

  1. 3.1 - 7.1: Not supported
  2. 8 - 10: Not supported (but has polyfill available)
  3. 10.1 - 12.1: Partial support
  4. 13: Partial support
  5. TP: Partial support

Opera

  1. 9 - 40: Not supported
  2. 41 - 63: Partial support
  3. 64 - 65: Supported
  4. 66: Supported

iOS Safari

  1. 3.2 - 10.2: Not supported
  2. 10.3 - 13.1: Partial support
  3. 13.2: Partial support
  4. 13.3: Partial support

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 80: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Partial support

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

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

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Not supported
  2. 5: Partial support
  3. 6.2 - 9.2: Supported
  4. 10.1: Supported

QQ Browser

  1. 1.2: Not supported (but has polyfill available)

Baidu Browser

  1. 7.12: Partial support

KaiOS Browser

  1. 2.5: Not supported (but has polyfill available)
Resources:
IE Web Platform Status and Roadmap: Custom Elements
Firefox tracking bug: Implement Custom Elements (from Web Components)
Google Developers - Custom elements v1: reusable web components
customElements.define polyfill
WebKit Blog: Introducing Custom Elements