TrustedTypePolicyFactory: emptyScript property
Baseline
2026
Newly available
Since February 2026, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
Note: This feature is available in Web Workers.
The emptyScript read-only property of the TrustedTypePolicyFactory interface returns a TrustedScript object containing an empty string.
This object can be used when the application requires an empty string to be inserted into an injection sink which is expecting a TrustedScript object.
Value
A TrustedScript object.
Examples
The specification explains that the emptyScript object can be used to detect support for dynamic code compilation.
Native Trusted Types implementations can support eval(TrustedScript), therefore in the below example a native implementation will return false for eval(trustedTypes.emptyScript). A polyfill will return a truthy object.
const supportsTS = !eval(trustedTypes.emptyScript);
eval(supportsTS ? myTrustedScriptObj : myTrustedScriptObj.toString());
Specifications
| Specification |
|---|
| Trusted Types # dom-trustedtypepolicyfactory-emptyscript |