On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Bun version 1.0.0 on 2023-09-08
In Chrome version 37 on 2014-08-26
In Chrome Android version 37 on 2014-09-03
In Deno version 1.13 on 2021-08-10
In Edge version 15 on 2017-04-05
In Firefox version 48 on 2016-08-02
In Firefox for Android version 48 on 2016-08-02
Not in Internet Explorer
In Node.js version 21.0.0 on 2023-10-17
In Quest Browser version 5.0 on undefined
In Opera version 24 on 2014-09-02
In Opera Android version 24 on 2014-09-10
In Safari version 15.4 on 2022-03-14 Note: The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.
In Safari on iOS version 15.4 on 2022-03-14 Note: The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.
In Samsung Internet version 3.0 on 2015-04-10
In WebView Android version 37 on 2014-09-03
In WebView on iOS version 15.4 on 2022-03-14 Note: The value of this property is clamped to 4 or 8 cores, to prevent device fingerprinting. See bug 233381.