Future: Move sandbox execution to ShadowRealms

[fregante]

The API is in Stage 3:

• https://github.com/tc39/proposal-shadowrealm/
• https://tc39.es/proposal-shadowrealm/
• https://chromestatus.com/feature/5638053476433920

  • Implementation status: No active development

Here's an in-depth review of the API:

• https://2ality.com/2022/04/shadow-realms.html

Interestingly, there's a polyfill for the API (but I assume it's node-only):

• https://github.com/leobalter/shadowrealms-polyfill

Most recent updates:

• ShadowRealm Web Platform integration testing and expectations tc39/proposal-shadowrealm#386 (comment)
• Path to Stage 4 tc39/proposal-shadowrealm#4 (comment)

Related issues for us:

• #5676: disable sandbox iframe injection #5677
• Move template engine and brick evaluation to Chrome sandbox #105
• Enable Sandbox for template rendering #5676

[twschiller]

Closing for now because it's not available