Some websites provide tools that let you create and edit documents that are then stored on your own hard disk. For example, you might use the tools at a website to create a travel log. When you’re ready to save the information, the website requests space on your disk to store the information you’ve created. The information is stored as a database.
By default, a website can use up to 5 MB of space on your disk for this purpose. If more space is required, Safari asks if you will allow more space. If you click Don’t Allow, the website may not be able to save your information.
In the Safari security preferences, you can specify a maximum amount of disk space for this purpose. You can also view and remove any databases that have been stored. Open Safari preferences and click the Security tab.