WYCIWYG
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WYCIWYG is an acronym of What You Cache Is What You Get. It is a URI scheme specific to the Mozilla family of web browsers which indicates that a link should be preferentially fetched from cache instead of from the web server.
The abbreviation is inspired by WYSIWYG but the concepts are unrelated.
The wyciwyg:// scheme name can sometimes be seen in the address bar of Gecko/Mozilla based browsers during Java/JavaScript errors, mid-script aborts, viewing the iframe source, and so on. Generally, direct or manually entered wyciwyg:// scheme links will not work because of cache age information.
Unauthorized access to wyciwyg:// documents was fixed by Mozilla in Firefox version 2.0.0.5.[1]

