From time to time one or another web site or web application (SPA, PWA whatever word is now trendy) faces that problem: it throws errors and does not work when private browsing mode is turned on. Real-world examples: Google+ signin, Amazon Cognito Identity SDK.
Here is more-or-less correct and complete list of things that don't work when private browsing (incognito mode) is turned on:
Here is more-or-less correct and complete list of things that don't work when private browsing (incognito mode) is turned on:
- Safari 10 and below: localStorage and sessionStorage API is present, but throws a DOMException.QUOTA_EXCEEDED_ERR when the code is trying to write something. Fixed in Safari 11
- IE10+/Edge: indexedDB is undefined
- Firefox: indexedDB is undefined
A similar situation may happen when the user has disabled cookies/data, e.g. in Chrome/Chromium: Settings -> "Show advanced settings..." -> "Content settings..." -> "Block sites from setting any data".
- Chrome/Chromium: cookies, localStorage, sessionStorage and indexedDB are disabled. Will throw "Uncaught SecurityError: Access to 'localStorage' is denied for this document".
- Firefox: cookies, localStorage, sessionStorage
- IE: cookies
And one more restriction exists in Safari when JavaScript is in strict mode: modification of error object may be forbidden (both overwriting existing property and adding a new one) and may throw
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