[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Page](./puppeteer.protocol.page.md) > [CreateIsolatedWorldResponse](./puppeteer.protocol.page.createisolatedworldresponse.md) > [executionContextId](./puppeteer.protocol.page.createisolatedworldresponse.executioncontextid.md) ## Protocol.Page.CreateIsolatedWorldResponse.executionContextId property Execution context of the isolated world. Signature: ```typescript executionContextId: Runtime.ExecutionContextId; ```