User agent sniffing

The navigator.userAgent property and several others loosely identify a browser. Selectively showing content based on the user agent string, also known as user agent sniffing, is unreliable. Consider using feature detection or user agent client hints instead.

Baseline Status: Achieved Widely Available on Mar 20, 2019 (Cross-browser Newly Available since Sep 20, 2016).

Desktop Browser Engine Support

Google Chrome

4

Supported

Mozilla Firefox

3.5

Supported

Apple Safari

10

Supported

Microsoft Edge

12

Supported

Mobile Browser Engine Support

Chrome Android

18

Firefox Android

4

Safari iOS

10

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys: