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

The nonce property of the HTMLElement interface returns the cryptographic number used once that is used by Content Security Policy to determine whether a given fetch will be allowed to proceed.

In later implementations, elements that have a nonce attribute only expose it to scripts (and not to side-channels like CSS attribute selectors). 


var nonce = HTMLElement.nonce
HTMLElement.nonce = nonce


A cryptographic nonce.


Specification Status Comment
HTML Living Standard
The definition of 'nonce' in that specification.
Living Standard Initial definition.

Browser Compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
nonceChrome Full support 61Edge No support NoFirefox No support NoIE No support NoOpera Full support YesSafari ? WebView Android Full support 61Chrome Android Full support 61Firefox Android No support NoOpera Android Full support YesSafari iOS ? Samsung Internet Android Full support 8.0


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Compatibility unknown  
Compatibility unknown