This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The Node.nodePrincipal read-only property returns the nsIPrincipal object representing current security context of the node.

Note: This property exists on all nodes (HTML, XUL, SVG, MathML, etc.), but only if the script trying to use it has chrome privileges.


principalObj = Node.nodePrincipal


An nsIPrincipal object representing the node's security context.


This property is read-only; attempting to write to it will throw an exception. In addition, this property may only be accessed from privileged code.


Not in any specification. This is a Firefox-specific property.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes — 461 ? ? ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes — 461 Yes — 461 ? ? ? ? Yes

1. This API was moved to the Element and Attr APIs according to the DOM4 standard.


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Last updated by: fscholz,