Can I use
?

Custom Elements (V1)

- LS

One of the key features of the Web Components system, custom elements allow new HTML tags to be defined.

Chrome

  1. 4 - 51: Not supported
  2. 52 - 53: Not supported (but has polyfill available)
  3. 54 - 66: Partial support
  4. 67 - 118: Supported
  5. 119: Supported
  6. 120 - 122: Supported

Edge

  1. 12 - 18: Not supported (but has polyfill available)
  2. 79 - 118: Supported
  3. 119: Supported

Safari

  1. 3.1 - 7.1: Not supported
  2. 8 - 10: Not supported (but has polyfill available)
  3. 10.1 - 17.0: Partial support
  4. 17.1: Partial support
  5. 17.2 - TP: Partial support

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 - 119: Supported
  6. 120: Supported
  7. 121 - 123: Supported

Opera

  1. 9 - 40: Not supported
  2. 41 - 63: Partial support
  3. 64 - 103: Supported
  4. 104: 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. 119: Supported

Safari on iOS

  1. 3.2 - 10.2: Not supported
  2. 10.3 - 17.0: Partial support
  3. 17.1: Partial support
  4. 17.2: Partial support

Samsung Internet

  1. 4: Not supported
  2. 5: Partial support
  3. 6.2 - 22: Supported
  4. 23: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 73: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 119: Supported

Firefox for Android

  1. 119: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Not supported (but has polyfill available)
  2. 3: Supported
Resources:
Google Developers - Custom elements v1: reusable web components
customElements.define polyfill
WebKit Blog: Introducing Custom Elements