ECMAScript 5

- OTHER

Full support for the ECMAScript 5 specification. Features include Function.prototype.bind, Array methods like indexOf, forEach, map & filter, Object methods like defineProperty, create & keys, the trim method on Strings and many more.

IE

  1. 5.5 - 7: Not supported
  2. 8: Not supported
  3. 9: Partial support
  4. 10: Supported
  5. 11: Supported

Edge

  1. 12 - 79: Supported
  2. 80: Supported

Firefox

  1. 2 - 3.6: Partial support
  2. 4 - 20: Partial support
  3. 21 - 71: Supported
  4. 72: Supported
  5. 73 - 74: Supported

Chrome

  1. 4 - 18: Partial support
  2. 19 - 22: Partial support
  3. 23 - 79: Supported
  4. 80: Supported
  5. 81 - 83: Supported

Safari

  1. 3.1 - 5.1: Partial support
  2. 6 - 12.1: Supported
  3. 13: Supported
  4. TP: Supported

Opera

  1. 9 - 12: Partial support
  2. 12.1: Partial support
  3. 15 - 65: Supported
  4. 66: Supported

iOS Safari

  1. 3.2 - 5.1: Partial support
  2. 6 - 13.1: Supported
  3. 13.2: Supported
  4. 13.3: Supported

Opera Mini

  1. all: Partial support

Android Browser

  1. 2.1 - 3: Partial support
  2. 4: Partial support
  3. 4.1 - 4.3: Partial support
  4. 4.4 - 4.4.4: Supported
  5. 76: Supported

Blackberry Browser

  1. 7: Partial support
  2. 10: Supported

Opera Mobile

  1. 10 - 12: Partial support
  2. 12.1: Partial support
  3. 46: Supported

Chrome for Android

  1. 79: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

  1. 10: Supported
  2. 11: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 9.2: Supported
  2. 10.1: Supported

QQ Browser

  1. 1.2: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

As the specification includes many JavaScript features, un-numbered partial support varies widely and is shown in detail on the ECMAScript 5 compatibility tables by Kangax.

Resources:
Overview of objects & properties
Detailed compatibility tables & tests
ES5 polyfill
Polyfill for all possible ES5 features is available in the core-js library
Sub-features:
ECMAScript 5 Strict Mode
JSON parsing