LocalStorage gotchas in Internet Explorer and Safari Posted on May 6, 2016

localStorage.setItem will throw an “Access denied” error in Internet Explorer InPrivate Browsing mode. Likewise, Safari will give you QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to add something to storage that exceeded the quota.

To avoid those errors, you will need to wrap your localStorage access in a try/catch block.