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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/TrustedTypePolicy below:

TrustedTypePolicy - Web APIs | MDN

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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.

TrustedTypePolicy.name Read only

A string containing the name of the policy.

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.

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;

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