Window: originAgentCluster property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The originAgentCluster read-only property of the Window interface returns true if this window belongs to an origin-keyed agent cluster: this means that the operating system has provided dedicated resources (for example an operating system process) to this window's origin that are not shared with windows from other origins.

Otherwise this property returns false.

Windows that are part of an origin-keyed agent cluster are subjects to some additional restrictions, compared with windows that are not. In particular, they cannot:

To request that the browser assign this window to an origin-keyed agent cluster, the server must send the Origin-Agent-Cluster response header.

Note that the origin-keyed agent cluster feature is only supported in secure contexts. If a site is not a secure context, the window.originAgentCluster will always return false.

Specifications

Specification
HTML
# origin-keyed-agent-clusters

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
originAgentCluster
Experimental

Legend

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Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also