Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The privateToken property of the HTMLIFrameElement interface returns a string representation of an options object representing a private state token operation; this object has the same structure as the RequestInit dictionary's privateToken property.
This attribute mirrors the content of the associated <iframe> element's privateToken attribute.
A string.
<iframe id="el" privateToken="{version: 1,operation: 'token-request'}">
</iframe>const el = document.getElementById("el");
console.log(el.privateToken);
// Logs "{version: 1,operation: 'token-request'}"