Can I infer the availability of sessionStorage from testing localStorage?

Question

If i were to test for localStorage in the users browser with JavaScript, eg

var hasStorage = (function() {
    try {
        localStorage.setItem(mod, mod);
        localStorage.removeItem(mod);
        return true;
    } catch (exception) {
        return false;
    }
}());

if (hasStorage) {
    // store things in places
}

(from: https://mathiasbynens.be/notes/localstorage-pattern )

Can I infer (without explicit checks) that if hasStorage === true , then sessionStorage is also available, or is it possible to have one disabled with the other enabled?

Answer 1

localStorage does not appear to be related to sessionStorage at chromium. It is possible to launch chromium with --disable-local-storage flag which logs error when trying to set localStorage

Uncaught TypeError: Cannot read property 'setItem' of null

though there does not appear to be an official flag to disable sessionStorage at chromium List of Chromium Command Line Switches . Note, chrome is built using chromium source code.