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

Changelogs

The changelogs detail the changes made from previous releases.

Fraud Protection

Find out more about Opera Fraud Protection.

Changing files and settings

• Sysadmin's handbook
• Command line options
• Opera's kiosk mode
• Opera.ini explained

Plug-ins and file formats

• Plug-ins
• File formats
• Files used by Opera