CSS3 Text-shadow

- CR

Method of applying one or more shadow or blur effects to text

IE

  1. 5.5 - 9
  2. 10
  3. 11

Edge

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

Firefox

  1. 2 - 3
  2. 3.5 - 75
  3. 76
  4. 77 - 78

Chrome

  1. 4 - 81
  2. 83
  3. 84 - 86

Safari

  1. 3.1 - 3.2
  2. 4 - 13
  3. 13.1
  4. TP

Opera

  1. 9
  2. 9.5 - 67
  3. 68

iOS Safari

  1. 3.2 - 13.3
  2. 13.4

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.4.4
  2. 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

Opera Mini ignores the blur-radius set, so no blur effect is visible. Text-shadow behavior can be somewhat emulated in older IE versions using the non-standard "dropshadow" or "glow" filters.

Resources:
Mozilla hacks article
Live editor
WebPlatform Docs