GitHub - tc39/proposal-ses: Draft proposal for SES (Secure EcmaScript)

Most of the action on the SES-shim is happening at https://github.com/Agoric/SES-shim/tree/master/packages/ses . Moddable is also directly building a SES machine as the primary configuration of the XS implementation of JS for embedded, as standardized in Ecma TC53. The most relevant proposal these days is https://github.com/tc39/proposal-compartments which is much more up to date than this proposa

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Secure ECMAScript(SES) Proposal. iframeなどを使わなくてもRealmを分けた(独立した)オブジェクトを作成することが出来る