:default CSS pseudo-class

- WD

Chrome

  1. 130
  2. 131
  3. 132
  4. 133
  5. 134
  6. 135
  7. 136

Edge

  1. 130
  2. 131
  3. 132
  4. 133

Safari

  1. 18.0
  2. 18.1
  3. 18.2
  4. 18.3
  5. 18.4
  6. TP

Firefox

  1. 132
  2. 133
  3. 134
  4. 135
  5. 136
  6. 137
  7. 138

Opera

  1. 111
  2. 112
  3. 113
  4. 114

IE

  1. 8
  2. 9
  3. 10
  4. 11

Chrome for Android

  1. 133

Safari on iOS

  1. 18.0
  2. 18.1
  3. 18.2
  4. 18.3
  5. 18.4

Samsung Internet

  1. 24
  2. 25
  3. 26
  4. 27

Opera Mini

  1. all

Opera Mobile

  1. 11.5
  2. 12
  3. 12.1
  4. 80

UC Browser for Android

  1. 15.5

Android Browser

  1. 4.2-4.3
  2. 4.4
  3. 4.4.3-4.4.4
  4. 133

Firefox for Android

  1. 135

QQ Browser

  1. 14.9

Baidu Browser

  1. 13.52

KaiOS Browser

  1. 2.5
  2. 3.0-3.1

Whether <option selected> matches :default (per the spec) was not tested since <select>s and <option>s are generally not styleable, which makes it hard to formulate a test for this.