TrustedTypePolicyFactory: getAttributeType() method

Available in workers

The getAttributeType() method of the TrustedTypePolicyFactory interface allows web developers to check if a Trusted Type is required for an element, and if so which Trusted Type is used.

Syntax

getAttributeType(tagName, attribute)
getAttributeType(tagName, attribute, elementNS)
getAttributeType(tagName, attribute, elementNS, attrNS)

Parameters

• tagName
  • : A string containing the name of an HTML tag.
• attribute
  • : A string containing an attribute.
• elementNS Optional
  • : A string containing a namespace, if empty defaults to the HTML namespace.
• attrNS Optional
  • : A string containing a namespace, if empty defaults to null.

Return value

A string with one of:

• "TrustedHTML"
• "TrustedScript"
• "TrustedScriptURL"

Or, null.

Examples

In this example, passing the <script> element and src attribute to getAttributeType() returns “TrustedScriptURL”.

console.log(trustedTypes.getAttributeType("script", "src")); // "TrustedScriptURL"

Specifications

Browser compatibility