On the standards track: No
Is Experimental: No
Is Deprecated: No
Not in Chrome
Not in Chrome Android
Not in Deno
Not in Edge
In Firefox version 1.5 on 2005-11-29
In Firefox for Android version 4 on 2011-03-29
Not in Internet Explorer
Not in Node.js
Not in Quest Browser
Not in Opera
Not in Opera Android
Not in Safari
Not in Safari on iOS
Not in Samsung Internet
Not in WebView Android