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The localStorage read-only property of the window interface allows you to access a Storage object for the Document 's origin; the stored data is saved across browser sessions.
localStorage is a property that allows JavaScript sites and apps to save key-value pairs in a web browser with no expiration date. This means the data stored in the browser will persist even after the browser window is closed.
In short, you can't, but you can set a cookie via JavaScript 😉 Safari on iOS supports localStorage, but in Private Mode it simply throws an error when you try to save anything to it, which is not great. Also it breaks the behaviour of your app on iPhones and iPads.
LocalStorage has no expiration time, Data in the LocalStorage persist till the user manually delete it.
We have a web app that runs in Facebook (i.e. a running in an iFrame at a different domain). If a Safari user has Cookies and Website Data set to the default, "Allow from websites I visit", the data we store via localStorage.setItem is acting like sessionStorage, i.e. it's not available beyond the user's current session (i.e. after the user closes the tab). If we change the setting to "Always allow", it works fine just like in Chrome, IE , etc.
As a test, we've tried navigating the browser to our app's domain (https://ourappname.appspot.com) directly and it works fine there. And also then it should truly be a visited website, but when going back to the game within Facebook, the problem still exists.
Note that the setItem call is succeeding, it's just that getItem doesn't return anything in a subsequent session. (So it's not like when the user is Private Browsing and the setItem call itself fails with a Quota Exceeded error.)
What do we need to do to support Safari so that our app, running within Facebook, can use localStorage as intended where the data will survive between sessions?
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