:optional CSS pseudo-class

- WD

The :optional pseudo-class matches form inputs (<input>, <textarea>, <select>) which are not :required.

Chrome

  1. 4 - 14: Support unknown
  2. 15 - 130: Supported
  3. 131: Supported
  4. 132 - 134: Supported

Edge

  1. 12 - 130: Supported
  2. 131: Supported

Safari

  1. 3.1 - 4: Not supported
  2. 5 - 18.0: Supported
  3. 18.1: Supported
  4. 18.2 - TP: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 132: Supported
  3. 133: Supported
  4. 134 - 136: Supported

Opera

  1. 9 - 9.6: Support unknown
  2. 10 - 12.1: Partial support
  3. 15 - 113: Supported
  4. 114: Supported

IE

  1. 5.5 - 9: Not supported
  2. 10: Supported
  3. 11: Supported

Chrome for Android

  1. 131: Supported

Safari on iOS

  1. 3.2 - 4.3: Not supported
  2. 5 - 18.0: Supported
  3. 18.1: Supported
  4. 18.2: Supported

Samsung Internet

  1. 4 - 25: Supported
  2. 26: Supported

Opera Mini

  1. all: Partial support

Opera Mobile

  1. 10 - 12.1: Partial support
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 2.2: Support unknown
  2. 2.3 - 4.4.4: Supported
  3. 131: Supported

Firefox for Android

  1. 132: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
MDN Web Docs - CSS :optional
HTML specification for `:optional`
JS Bin testcase