Browser Compatibility Testing of JAVASCRIPT ECMAScript 5

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Google Chrome

Chrome browser version 4 to Chrome browser version 22 partially supports. Enabled in Chrome through the "experimental Web Platform features" flag in chrome://flags. Chrome browser version 23 to Chrome browser version 70 supports JAVASCRIPT ECMAScript 5.

Mozilla Firefox

Mozilla Firefox browser version 2 to Mozilla Firefox browser version 20 partially supports JAVASCRIPT ECMAScript 5 and partial support in Mozilla Firefox refers to supporting an older version of the specification. Firefox version 22 to 63 supports JAVASCRIPT ECMAScript 5.

Internet Explorer

IE browser version 6 to 8 doesn't supports it. IE browser version 9 partially supports it and partial support in IE refers to supporting an older version of the specification. IE browser version 10 and 11 supports JAVASCRIPT ECMAScript 5.


Safari browser version 3.1 to Safari browser version 5.1 partially supports. Safari browser version 6 to Safari browser version 12 supports JAVASCRIPT ECMAScript 5.

Microsoft Edge

Microsoft Edge browser version 12 to Microsoft Edge browser version 18 supports JAVASCRIPT ECMAScript 5 property.


Opera browser version 10.1 and 12.1 partially supports JAVASCRIPT ECMAScript 5. Opera browser version 32 to Opera browser version 53 supports JAVASCRIPT ECMAScript 5.

Information sourced from

"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.

  • Google Chrome
  • Mozilla
  • Edge
  • IE
  • opera
  • Safari
  • Yandex

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