When text overflows the screen, CordovaSim does not display a vertical scrollbar on the Mac. This requires adding some CSS rest rules explicitly, namely this:

html, body {
    overflow-x: hidden;
    overflow-y: auto;
}

Then and only then does the vertical scrollbar appear. This CSS reset should not be necessary only for the Mac. It is not required in other OSes and also not even on BrowserSim (on Mac).