TrustedTypePolicy

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Note: This feature is available in Web Workers.

The TrustedTypePolicy interface of the Trusted Types API defines a group of functions which create TrustedType objects.

A TrustedTypePolicy object is created by TrustedTypePolicyFactory.createPolicy() to define a policy for enforcing security rules on input. Therefore, TrustedTypePolicy has no constructor.

Instance properties

TrustedTypePolicy.name Read only

A string containing the name of the policy.

Instance methods

Examples

In the below example we create a policy that will create TrustedHTML objects using TrustedTypePolicyFactory.createPolicy(). We can then use TrustedTypePolicy.createHTML to create a sanitized HTML string to be inserted into the document.

The sanitized value can then be used with Element.innerHTML to ensure that no new HTML elements can be injected.

html
<div id="myDiv"></div>
js
const escapeHTMLPolicy = trustedTypes.createPolicy("myEscapePolicy", {
  createHTML: (string) => string.replace(/</g, "&lt;"),
});

let el = document.getElementById("myDiv");
const escaped = escapeHTMLPolicy.createHTML("<img src=x onerror=alert(1)>");
console.log(escaped instanceof TrustedHTML); // true
el.innerHTML = escaped;

Specifications

Specification
Trusted Types
# trusted-type-policy

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
TrustedTypePolicy
createHTML
createScript
createScriptURL
name

Legend

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Full support
Full support
No support
No support
See implementation notes.