Custom Elements (deprecated V0 spec)

- UNOFF

Original V0 version of the custom elements specification. See Custom Elements V1 for support for the latest version.

IE

  1. 5.5 - 9
  2. 10
  3. 11

Edge

  1. 12 - 18
  2. 79
  3. 80 - 81
  4. 83

Firefox

  1. 2 - 22
  2. 23 - 29
  3. 30 - 58
  4. 59 - 75
  5. 76
  6. 77 - 78

Chrome

  1. 4 - 26
  2. 27 - 32
  3. 33 - 79
  4. 80 - 81
  5. 83
  6. 84 - 86

Safari

  1. 3.1 - 5.1
  2. 6 - 13
  3. 13.1
  4. TP

Opera

  1. 9 - 12.1
  2. 15 - 19
  3. 20 - 66
  4. 67
  5. 68

iOS Safari

  1. 3.2 - 6.1
  2. 7 - 13.3
  3. 13.4

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.4
  2. 4.4.3
  3. 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 - 10.1
  2. 11.1

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5
Resources:
Google Developers - Custom elements v1: reusable web components
document.registerElement polyfill in 3KB minified & gzipped
HTML5Rocks - Custom Elements: defining new elements in HTML
Polymer project (polyfill & web components framework)