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Google Chrome Browser Client-Side Storage

What does Client-Side Storage, also known as Web Storage, mean?

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Today, almost all new web browsers like Chrome, Firefox, Opera etc. support various types of client-side storage. In fact, any website, extension, or web application has the ability to store megabytes of data onto your computer's hard disk. In other words, any website, extension, or web application can use your copmuter's hard drive as a client-side storage to store any data, for example, extension preferences, your shopping cart data, session information such as login IDs, exact time when you visited a particular site, what site referred you to the web page, or anything else.

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Client-Side Storage

The various types of Client-Side Storage Data available in Google Chrome

TypeQuota Chrome Profile A Chrome profile, which is basically a data directory with different files and subdirectories, contains all browser related information. Click&Clean Options
History Eraser Options
Cookies A cookie is a small amount of data created in the course of browsing the Web that are stored on your computer's hard drive to help facilitate certain web site functions. It contains information about how many times you have visited the site, how long you have been on the site, your login information, etc. Despite cookies are useful, they also pose a potential security and privacy risk.
The limit is 4K per cookie (150-180 cookies per domain for a total of 720KB) Wiki
Local Storage Local Storage, similar to cookies, lets a website, an extension or app to store data on your computer's hard disk.
By default, the limit is 5MB per domain *
W3C, Wiki
Web Databases (SQL) Web SQL Databases allows websites, extensions or apps to store data in a structured manner on the your computer. It useful for offline browsing.
By default, the limit is 5MB per domain *
W3C, Wiki
IndexedDB Some websites, extensions or apps can store data in a Indexed Database. Data in a Indexed Database is organized as a set of records. The database maintains indexes over records it stores. Each record consists of a key-value pair. A website can store any data in the client-side indexed database (names, credit card numbers, addresses) obtained by the site
By default, the limit is 5MB per domain *
W3C, Wiki
File System A website (extension, app) may use sandboxed sections of a user's local filesystem. A sanboxed section is just a subdirectory named File System in your Chrome profile directory, where data is stored in files. Websites can manage (create, delete, read, write) files and folders in this sandboxed subdirectory. There are a number of security and privacy issues
By default, the limit is 5MB per domain *
W3C
Application Cache Enables a website to work without the user being connected to the internet. A web page can provide a manifest which lists the files that are needed for the web page to work offline. All cached files located in a subdirectory named Application Cache in your Chrome profile directory. Application caches and cookies have similar implications with respect to privacy and security
By default, the limit is 5MB per domain *
W3C
Flash Cookies (LSO) Flash Cookies, also called "Local Shared Objects" or "LSOs" stored as a data file on your PC. These can be used to track your browsing (for saves/ high scores / timings... whatever).
By default, the limit is 100K per domain (but can be 0, 10KB, 100KB, 1MB, 10MB or even unlimited)
Wiki
Silverlight Cookies Microsoft Silverlight is a technology similar to Flash. Like Flash, Silverlight maintains hidden cookies on your PC that are outside the reach of your browser's controls.
By default, the limit is 1MB per domain (an application that is taken out of the browser has its quota set to 25Mb)
Microsoft

* An extension or App can use "unlimitedStorage" option to provide an unlimited quota for storing client-side data.

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