Is HTML5 offline storage safe?

Just like cookies, HTML5 offline storage shouldn't be used to store sensitive information (e.g., user IDs or payment information). It can be easily accessed by any JS script and compromised in case of a cross-scripting attack. When downloading huge files, you may encounter an error called Out of HTML5 Offline Storage Space.

Does HTML5 have a storage quota?

HTML5 introduced many storage APIs that let you store a large amount of data locally in your users' browsers. But the amount of space allocated for each app is, by default, restricted to a few megabytes. Google Chrome lets you ask for a larger storage quota, beyond the previous limit of just 5 MB.

Why do I get Out of HTML5 storage space error?

No.1 reason is quite obvious, the error occurs when your pc doesn’t have enough space to handle the task. So make sure your hard drive has enough space sufficient to store the downloading file. Sometimes, the out of HTML5 storage space error occurs even you have enough space too. This is the 2nd reason for the occurrence of the error.

What is HTML5 Local storage?

HTML5 local storage keeps the data in two JavaScript objects. Both of them are accessed in the same way and available globally: The JavaScript localStorage object stores data which doesn't expire. It will be available even if you end the session by closing your browser and stay till you delete it manually.