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Change Host <> Sandbox communication protocol to "SHOULD" #435

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Change Host <> Sandbox communication protocol to "SHOULD" #435

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4 changes: 2 additions & 2 deletions specification/draft/apps.mdx
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Expand Up @@ -491,8 +491,8 @@ If the Host is a web page, it MUST wrap the View and communicate with it through

1. The Host and the Sandbox MUST have different origins.
2. The Sandbox MUST have the following permissions: `allow-scripts`, `allow-same-origin`.
3. The Sandbox MUST send a `ui/notifications/sandbox-proxy-ready` notification to the host when it's ready to process an `ui/notifications/sandbox-resource-ready` notification.
4. Once the Sandbox is ready, the Host MUST send the raw HTML resource to load in a `ui/notifications/sandbox-resource-ready` notification.
3. The Sandbox SHOULD send a `ui/notifications/sandbox-proxy-ready` notification to the host when it's ready to process an `ui/notifications/sandbox-resource-ready` notification.
4. Once the Sandbox is ready, the Host SHOULD send the raw HTML resource to load in a `ui/notifications/sandbox-resource-ready` notification.
5. The Sandbox MUST load the raw HTML of the View with CSP settings that:
- Enforce the domains declared in `ui.csp` metadata
- If `frameDomains` is provided, allow nested iframes from declared origins; otherwise use `frame-src 'none'`
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