Checks createContext().
{
    method : Runtime.executionContextCreated
    params : {
        context : {
            id : 1
            name : 
            origin : 
        }
    }
}
{
    method : Runtime.executionContextCreated
    params : {
        context : {
            id : 2
            name : 
            origin : 
        }
    }
}
{
    id : <messageId>
    result : {
        debuggerId : <debuggerId>
    }
}
#debugger;

setTimeout(x => x #* 3, 0)

Reported script's execution id: 2
{
    method : Runtime.executionContextCreated
    params : {
        context : {
            id : 1
            name : 
            origin : 
        }
    }
}
{
    method : Runtime.executionContextCreated
    params : {
        context : {
            id : 2
            name : 
            origin : 
        }
    }
}
#debugger;

setTimeout(x => x #* 3, 0)

Reported script's execution id: 2