In this article, we’ll show you how to make embedded content responsive using CSS, so that content such as video and calendars resize with the browser’s viewport. One of these is the good ol’ iframe, which you may need to use when embedding content from external sources such as YouTube. In this article, we’ll show you how to make embedded content responsive using CSS.Ī few HTML elements don’t play nice with responsive layouts. A few HTML elements don’t play nice with responsive layouts. Its value is undefined in a web browser that does not support. Window.credentialless is true inside a credentialless iframe and false otherwise. # How to detect the document has been embedded in a credentialless iframe? They can't communicate with the credentialless iframe. They are created in a new regular top-level context and are not credentialless. Pop-ups are opened as if noopener was set. # Are pop-ups created from credentialless as well? Once an iframe is credentialless, that applies to all iframes in the whole subtree even without a credentialless attribute. W3C TAG Request for position: satisfied. # FAQ # Will this feature be adopted by other browsers? You can check out a demo of a credentialless iframe. If an iframe contains only public data, then it is not valuable to an attacker. They are still secure: because they are loaded from a new empty context everytime, they should not contain personalized data, which is what attackers are after. All this storage is cleared once the top-level document is unloaded.Ĭredentialless iframes are not subject to COEP embedding rules. The partition is scoped to both the current top-level document and the origin of the iframe. Likewise, storage APIs such as LocalStorage, CacheStorage, IndexedDB, and so on, load and store data in the new ephemeral partition. Instead, it starts with an empty cookie jar. This iframe is created in a new ephemeral context and doesn't have access to any of the cookies associated with the top level website. This allows for removing the COEP restriction. In particular, it is loaded without cookies. By adding the credentialless attribute to the element, the iframe is loaded from a different, empty context. We're introducing to help embed third-party iframes that don't set COEP. Iframes without those headers will not be loaded by the browser. One of the biggest challenges is that all cross-origin iframes must deploy COEP and CORP. While cross-origin isolation brings webpages better security and the ability to enable powerful features, deploying COEP can be difficult. See the documentation for further details. To enable cross-origin isolation, websites must send the following HTTP headers: Cross-Origin-Embedder-Policy : require-corpĬOEP:credentialless can also be used as an alternative to require-corp. Cross-origin isolation allows websites to use privileged features including SharedArrayBuffer, asureUserAgentSpecificMemory(), and high-precision timers with better resolution. To mitigate that risk, browsers offer an opt-in-based isolated environment called cross-origin isolation, which requires deploying COEP. Some web APIs increase the risk of side-channel attacks such as Spectre. It was previously available as an origin trial from version 106 to 108, and known as anonymous iframe.
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