Documentation
Opera is famous for its speed, small size, security, customization and standards-support. These documents allow for a look behind the user interface, and supply advice for changing files and advanced settings.
Specifications
Opera prides itself in supporting all major Web standards currently in use, including CSS 2.1, XHTML 1.1, HTML 4.01, WML 2.0, ECMAScript, DOM 2 and SVG 1.1 tiny.
Changelogs
The changelogs detail the changes made from previous releases.
Banner ads
Find out more about Opera's banner advertisement implementation.
Note that banner ads are only used in unregistered versions prior to Opera 8.5 (when all ads were removed).
