We got excellent question from Andreas on adding Access-Control-Allow-Origin on Subdomains. As you see Access-Control-Allow-Origin "*" allows you to access all resources and webfonts from all domains. Reenable feature policy control over fullscreen This CL also changes test expectations to bring the fullscreen tests in line with the new behaviour prescribed by Feature Policy. By default you can not execute Javascript on different domains because of browser cross domain security restrictions. By checking the referrer, the new webpage can see where the request originated. This means the same-origin policy will be violated. When a custom visual makes a request to an external site, its origin does not match that of the site in question and will fail the same-origin policy check. See an example of this test, in it the full-screen mode of the test Youtube video is blocked precisely by … E.g. You can listen to them with the onload and onerror attribute respectively: Or if you can add the listeners to your iframe programmatically. Then, change the `Origin-Policy` response header to indicate that this new policy is preferred: Origin-Policy: preferred="policy-2", allowed=("policy-1") When the browser sees this header value on any response from https://example.com, one of three things will happen: It will have no origin policy cached for https://example.com. Avoid using the document.domain setter. If you do use both attributes, then the most restrictive one will apply. For details, see the Fullscreen display topic in the Size the Player document. It's just an intro showing a request that works followed by one that fails. Restricting this list through the header means that even if an iframe specifies an origin, if the origin is not allowed by the header, the feature will not be given to the framed document. The sync-xhr feature is allowed by the current origin and https://example.com and usermedia is … Note that autoplay is allowed by default on same-origin iframes. I prefer to have only 1. Feature-Policy: fullscreen 1 Syntax. *: The feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin. 2 Default policy. The default value is 'self'. 3 Examples. SecureCorp Inc. ... 4 Specifications. Initial definition. ... 5 Browser compatibility 6 See also Allowing fullscreen. 2) Page is loaded. , window.open("link_to_a_slide", "", "allowfullscreen"). It undermines the security protections provided by the same-origin policy. Given a string (policyString), this algorithm returns a document policy, if it can be parsed as one, or else fails.Let policy be a new ordered map.. Let defaultEndpoint be a new string, set to null.. Let dict be the result of parsing policyString as a dictionary.. We suggest not to use this feature without understanding security implications of giving access to host object from from iframes with unknown origins. It's still possible for games inside iframes to switch in to fullscreen mode, where it takes up the entire display. Apply same origin rule. 3) An iframe is created, causing creation of HTMLIFrameElement.prototype with a "policy" attribute on it. If the external site is configured to allow requests from any origin (*), it will give consent for the visual to access its … The Referrer-Policy is a security header field that identifies the address of the webpage that requested the current webpage. list with origins - during access to host object from iframe the origin will be checked that it belongs to this list; list with "*" element - host object will be available for iframe for all origins. When this policy is enabled, the returned Promise rejects with a TypeError. There is a long list of features that web browsers use such as geolocation, microphones and cameras etc. That’s possible too! If the parent iframe does not have the attribute allowfullscreen, then enabling full-screen mode by adding this attribute to the nested iframe will fail - fullscreen mode will not work. The error event that is triggered when the loading failed. Feature-Policy: vibrate 'self'; usermedia *; sync-xhr 'self' https://example.com In the above example by specifying vibrate and allowing it for self the feature is disabled for all origins except our own. --> Review: Same-origin policy. r=baku — Details We can clean up this code once the feature policy pref goes away, but … Using Sub domains with Advanced iFrame. The sandbox attribute enables an extra set of restrictions for the content in the iframe. First, let's clarify that the behavior observed here (the iframe does not render) is much stricter than the default same-origin policy. Fullscreen on initial load may be only allowed if the load was triggered by a page in the same origin. Without the iframe allow attribute above, camera and microphone access won't be allowed in cross origin iframes in browsers that have Feature Policy implemented (see browser support below). 4) Feature policy pref is disabled. The scrolling and noresize attributes are necessary to ensure the iframe displays at the correct size on some versions of iOS. So you can do a basic check already there. Specifies a feature policy for the