HTMLIFrameElement: credentialless property

Limited availability

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

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The credentialless property of the HTMLIFrameElement interface indicates whether the <iframe> is credentialless, meaning that documents inside will be loaded using new, ephemeral contexts.

Those contexts do not have access to their network, cookies and storage data associated with their origin. Instead, they use new ones, local to the top-level document lifetime. It means any data stored won't be accessible anymore after the user navigates away from the page or reloads it.

In return, the Cross-Origin-Embedder-Policy (COEP) embedding rules can be lifted, so documents with COEP set can embed third-party documents that do not. See IFrame credentialless for a deeper explanation.

Value

A boolean. The default value is false; set it to true to make the <iframe> credentialless.

Examples

Get

Specify a credentialless <iframe> like so:

html
<iframe
  src="https://en.wikipedia.org/wiki/Spectre_(security_vulnerability)"
  title="Spectre vulnerability Wikipedia page"
  width="960"
  height="600"
  credentialless></iframe>

Return the credentialless property value:

js
const iframeElem = document.querySelector("iframe");
console.log(iframeElem.credentialless); // will return true in supporting browsers

Set

Alternatively, specify the minimum of details in the HTML:

html
<iframe width="960" height="600"> </iframe>

And set credentialless to true then load the <iframe> contents via script:

js
const iframeElem = document.querySelector("iframe");

iframeElem.credentialless = true;
iframeElem.title = "Spectre vulnerability Wikipedia page";
iframeElem.src =
  "https://en.wikipedia.org/wiki/Spectre_(security_vulnerability)";

Specifications

Specification
Iframe credentialless
# dom-htmliframeelement-credentialless

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
credentialless
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also