On the standards track: Yes
Is Experimental: No
Is Deprecated: Yes
In Chrome version 1 on 2008-12-11
In Chrome Android version 18 on 2012-06-27
Not in Deno
In Edge version 12 on 2015-07-29
In Firefox version 2 on 2006-10-24 Note: From Firefox 78 AddSearchProvider() does nothing, as the specification requires.
In Firefox for Android version 4 on 2011-03-29 Note: From Firefox for Android 79 AddSearchProvider() does nothing, as the specification requires.
In Internet Explorer version 4 on 1997-09-30
In Quest Browser version 5.0 on undefined
In Opera version 15 on 2013-07-02
In Opera Android version 14 on 2013-05-21
Not in Safari
Not in Safari on iOS
In Samsung Internet version 1.0 on 2013-04-27
In WebView Android version 4.4.3 on 2014-06-02
Not in WebView on iOS