On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 80 on 2020-02-04
Not in Chrome Android
In Edge version 80 on 2020-02-07
In Firefox version 114 on 2023-06-06
In Firefox for Android version 114 on 2023-06-06
Not in Internet Explorer
Not in Quest Browser
In Opera version 67 on 2020-03-03
Not in Opera Android
In Safari version 15 on 2021-09-20 Note: Nested workers support was introduced in Safari 15.5. Script loading in nested workers was introduced in Safari 16.4.
In Safari on iOS version 15 on 2021-09-20 Note: Nested workers support was introduced in Safari on iOS 15.5. Script loading in nested workers was introduced in Safari on iOS 16.4.
Not in Samsung Internet
Not in WebView Android
In WebView on iOS version 15 on 2021-09-20 Note: Nested workers support was introduced in WebView on iOS 15.5. Script loading in nested workers was introduced in WebView on iOS 16.4.