User agent sniffing
Widely Available (since 2019-03-20)
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.
Browser support
- Chrome 4 Released on 2010-01-25
- Chrome Android 18 Released on 2012-06-27
- Edge 12 Released on 2015-07-29
- Firefox 3.5 Released on 2009-06-30
- Firefox for Android 4 Released on 2011-03-29
- Safari 10 Released on 2016-09-20
- Safari on iOS 10 Released on 2016-09-13
MDN documentation
Specifications
- HTML (#the-navigator-object), from HTML Workstream (WHATWG).
Web Platform Tests (WPT)
View the latest WPT test results for this featureView as JSON | Edit this feature | Report an issue | Web-features entry: source, dist