Custom Elements (V1)

- LS

Method of defining new HTML tags.

IE

  1. 5.5 - 9
  2. 10
  3. 11

Edge

  1. 12 - 18
  2. 79 - 81
  3. 83

Firefox

  1. 2 - 29
  2. 30 - 49
  3. 50 - 58
  4. 59 - 62
  5. 63 - 75
  6. 76
  7. 77 - 78

Chrome

  1. 4 - 51
  2. 52 - 53
  3. 54 - 66
  4. 67 - 81
  5. 83
  6. 84 - 86

Safari

  1. 3.1 - 7.1
  2. 8 - 10
  3. 10.1 - 13
  4. 13.1
  5. TP

Opera

  1. 9 - 40
  2. 41 - 63
  3. 64 - 67
  4. 68

iOS Safari

  1. 3.2 - 10.2
  2. 10.3 - 13.3
  3. 13.4

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.4.4
  2. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12.1
  2. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4
  2. 5
  3. 6.2 - 10.1
  4. 11.1

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5
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