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Portals is not yet available in origin trial. Stay tuned!

Google Chrome is running an origin trial to give developers an opportunity to experiment with the Portals feature that we are working on, and gather feedback about how we can make it better.

This experiment will begin in Chrome XX and end in Chrome YY. During this experiment, you can use an origin trial token to experiment with using portals to load first-party content (i.e. content served from the same origin as the main page).

Frequently Asked Questions

How do I sign up?

Once the origin trial begins, go to the Origin Trials developer console:

Your tokens will periodically expire and need to be renewed using this console.

How can I provide feedback?

Thanks for asking! When you renew your origin trial token, we’ll ask for your feedback. This is the best place to explain how you’re using portals, what’s working well, and what isn’t.

If you find bugs in Chrome’s implementation (for example, Chrome crashes when you use portals), please file a Chromium bug. Make sure to mention Portals in your report so that the bug is triaged appropriately.

If you identify specific issues with the CG draft specification or the design of the feature (for example, if it’s difficult to achieve the effect you’re looking for using the available API), please file a spec issue.

Why was the page blocked from loading in a portal?

For the duration of this experiment, pages are only permitted to load URLs that match their origin. This means that the scheme (http or https), full hostname (including subdomains) and port (if specified) must match. This restriction applies to any URLs encountered by following redirects, and any navigations that occur after loading within the portal.

If your content attempts to load a third-party web page in a portal, it will be blocked and the previously loaded page, if any, will be displayed instead.

When this happens, a warning will be logged to the developer console, including the origin of the URL that was blocked.

Navigating a portal to cross-origin content (from is not currently permitted and was blocked.

Your load may also be blocked for other reasons. If either document has a Content Security Policy that does not permit embedding, Chrome will respect it. For example, if the URL to be loaded in the portal has a frame-ancestors directive that does not include self (or your origin), the load will be blocked.

I was already using Portals, and I started seeing that warning message. What gives?

First, thanks for trying out Portals! If Portals were previously working for you, you are a developer who has previously turned on the Portals feature flag. (Note that this is not recommended in your main browser, just in your development environment where you're experimenting with Portals.)

This origin trial allows developers like you to enable Portals for Chrome users. Since this experiment does not yet cover loading cross-origin content, we've changed the default behavior to be limited to same-origin content. To return to allowing cross-origin content, run Chrome with the command-line switch --enable-features=PortalsCrossOrigin.

Why can’t I use this from a local file:// URL?

Portals is a powerful feature, and we need to be able to establish the origin of the content, and of the content it is loading in a portal, in order to ensure that it is used safely. Unfortunately this means that you will need to run an HTTP server in order to experiment with portals.