To reference subscriber, system, and sendable Data Extension attributes for content personalization using SSJS, the correct syntax is<ctrl:field name="attributeName" />. This tag allows you to dynamically insert the value of an attribute into the email content.
* <ctrl:field>Tag: This tag is used to insert the value of an attribute from a Data Extension or subscriber attribute into the content. Thenameattribute of the<ctrl:field>tag specifies which attribute's value should be used.
%%[ var @firstName set @firstName = AttributeValue("FirstName") ]%%
Hello,<ctrl:fieldname="FirstName"/>!