How can I store things on the browser?

The traditional web browser is a “thin client” which interacts with a web server. The user’s virtual shopping trolley is kept on the web server, and the browser gets/sets it with HTTP requests. But today’s browsers support “fat” clients; web applications can store state on the local browser. There are lots of ways to store this state! Let’s look at some of them:

Storage type Appeared Deprecated? Support
HTTP Cookies 1994 No ~100%
LocalStorage 2009 No 94%
SessionStorage 2009 No 94%
IndexedDB 2010 No 92%
CacheStorage 2013 No 73%
WebSQL 2009 Yes, 2010 83%
AppCache 2009 Yes, 2015 93%
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