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.

• Web standards supported in Opera
• Security specs in Opera Presto 2.1.1

Changing files and settings

• Sysadmin's handbook
• Command line options
• Opera's kiosk mode
• Opera.ini explained
• Browser JavaScript explained
• User JavaScript
• User CSS

Opera version history

Captures the history of Opera versions, technology, and major release features.

Changelogs

The changelogs detail the changes made from previous releases.

White Papers

• Fraud Protection
• Extensible Rendering Architecture
• Root Certificates

Plug-ins and file formats

• Plug-ins
• Associated file formats
• Files used by Opera