Can I use
?

ECMAScript 5 Strict Mode

- OTHER

Method of placing code in a "strict" operating context.

Chrome

  1. 4 - 12: Not supported
  2. 13 - 110: Supported
  3. 111: Supported
  4. 112 - 114: Supported

Edge

  1. 12 - 110: Supported
  2. 111: Supported

Safari

  1. 3.1 - 4: Not supported
  2. 5 - 5.1: Partial support
  3. 6 - 16.3: Supported
  4. 16.4: Supported
  5. 16.5 - TP: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 110: Supported
  3. 111: Supported
  4. 112 - 113: Supported

Opera

  1. 9 - 11.5: Not supported
  2. 11.6 - 94: Supported
  3. 95: Supported

IE

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

Chrome for Android

  1. 111: Supported

Safari on iOS

  1. 3.2 - 4.3: Not supported
  2. 5 - 16.3: Supported
  3. 16.4: Supported
  4. 16.5: Supported

Samsung Internet

  1. 4 - 19.0: Supported
  2. 20: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10 - 11.1: Not supported
  2. 11.5 - 12.1: Supported
  3. 73: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 2.3: Not supported
  2. 3 - 4.4.4: Supported
  3. 111: Supported

Firefox for Android

  1. 110: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
Article with test suite
Information page