:default CSS pseudo-class

- WD

Chrome

  1. 154
  2. 155
  3. 156
  4. 157
  5. 158
  6. 159
  7. 160

Edge

  1. 153
  2. 154
  3. 155
  4. 156

Safari

  1. 26.6
  2. 27
  3. 27.1
  4. 27.2
  5. 27.3
  6. TP

Firefox

  1. 157
  2. 158
  3. 159
  4. 160
  5. 161
  6. 162
  7. 163

Opera

  1. 136
  2. 137
  3. 138
  4. 139

IE

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

Chrome for Android

  1. 157

Safari on iOS

  1. 26.4
  2. 26.5
  3. 26.6
  4. 27.0
  5. 27.1
  6. 27.2

Samsung Internet

  1. 28
  2. 29
  3. 30
  4. 31

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. 157

Firefox for Android

  1. 160

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.