Code name

• Opera 11.50 uses "Swordfish" as its code name.

Improved user interface

Opera developers continue to make Opera light, bright, and as user-friendly as possible without sacrificing power or flexibility. Some changes are highly visible, such as those to the address and status bars. Also, you will find that much of the skin has been reworked, including a brand new icon set. Some highlights are:

• Brand new toolbar icon set
• Brighter, softer colors for backgrounds and borders
• Padding and alignment improvements
• Updated status bar design and content
• Removed button borders in the address bar
• The Home and Fast Forward buttons are now optional
• New "tab fold" attention state: no more blue blob

Opera extensions

• Opera extensions can now share cookies with the browser. You will not have to log in separately from an extension.

Opera Link: Password synchronization

The most requested feature for Opera Link is password synchronization.

• You can enable it when you set up link for the first time or in the Synchronization Options dialog.

Opera Mail

• Improved the Gmail IMAP support that was added in Opera 11.10.
• Added support for setting designated "Trash" and "Spam" folders for IMAP servers that do not support the X-LIST or Special-Use IMAP extensions.
• Added a "Match messages in" setting that can be set on any label with filter rules.
• For further details, please see Rijk van Geijtenbeek's article in the Opera Desktop Blog.

Opera Next

Opera Next is a stand-alone installation of the Opera desktop browser intended for testing the development of new features, technologies, and improvements.

• It is automatically updated to include the latest changes as they become available.
• Important note: Pre-release builds may be unstable and include known issues, such as crashes or data loss situations.
• See: What is Opera Next?

Opera Presto 2.9 rendering engine

• Opera 11.50 uses the new Opera Presto 2.9 rendering engine (Presto/2.9.168).

Speed Dial extensions

Speed Dial extensions are like small web pages embedded in your Speed Dial powered by Opera's extension framework.

• They allow developers to make live previews of web pages or other nice decorations for your Speed Dial.
• The Add Speed Dial dialog now promotes Speed Dial extensions, and the way Speed Dial extensions are shown in the extensions manager has been improved.
• You can also install the same Speed Dial extension more than once.
• See: Opera Extensions API: Speed Dial guide
• See: Creating Opera Speed Dial Extensions
• See: Extensions - in Speed Dial!

Speed Dial tab activation improvements

• When Speed Dial is the active tab, other tabs are not activated on mousedown.
• This allows you to drag open tabs into Speed Dial.
• Hovering a Speed Dial tab while dragging something will also activate it.

Windows installer

• The Windows installer now has an option to pin Opera to the taskbar on Windows 7.

Web specifications support

For further detailed information, please see:

• Web specifications support in Opera Presto 2.9
• Web specifications support in Opera products

CSS

• Improved deep nesting of the quotes property.
• See: W3C CSS 2.1 Section 12.3: Quotation marks
• Support is added to provide the original source line for CSS rules, benefiting future versions of Opera Dragonfly.
• Improved CSS parsing performance is up to 10-15% faster due to CSS tokenizing optimizations.

DOM event handling

• Updated the list of DOM events visible on window, document and element objects.
• Events supported by Opera and part of the Window interface of the HTML standard are now exposed on the window object.
• Events supported by Opera and part of the HTMLDocument interface are now exposed on the HTMLdocument object.
• onstorage has been removed.
• Events supported by Opera and part of the HTMLElement interface are exposed on all elements, unless the events are form specific, in which case they remain visible only on form elements.
• See: HTML5 elements, attributes, and APIs support in Opera Presto 2.8
• See: W3C HTML5 Section 3.1.1: Documents in the DOM
• See: W3C HTML5 Section 3.2.2: Elements in the DOM
• See: W3C HTML5 Section 5.2: The Window object

HTML5 dataset attribute

• Added support for the dataset attribute on elements which exposes data-* attributes on an element.
• See: Dev.Opera: An Introduction to Datasets
• See: HTML5 elements, attributes, and APIs support in Opera Presto 2.8
• See: W3C HTML5 Section 3.2.3.8: Embedding custom non-visible data with the data-* attributes

HTML5 <input> indeterminate attribute

• Added support for the <input> element indeterminate attribute for checkboxes. This is used to change the appearance of checkbox controls.
• See: HTML5 Section 4.10.7: The input element.

HTML5 Session history and navigation

• Added support for the history interface.
• See: HTML5 Session History and Navigation support in Opera Presto 2.8
• See: W3C HTML5 Section 5.4: Session history and navigation

HTML5 and SVG classList attribute

• Enabled the classList attribute for HTML and SVG elements.
• See: HTML5 elements, attributes, and APIs support in Opera Presto 2.8
• See: W3C HTML5 Section 3.2.3.6: The class attribute

HTML5 <time> element

• Implemented the HTML5 <time> element.
• See: W3C HTML5 Section 4.6.10: The time element.
• See: W3C HTML5 Section 10.4.17: The time element

Opera Widgets specification

• Default widget size has been overridden from 100x100 to 300x300.
• See: Opera Widgets specification

Selectors API

• Implemented Element.oMatchesSelector.
• Prefixed implementation of the Element interface .matchesSelector method with "o".
• Note: The refNodes parameter is not supported.
• See: W3C Selectors API Level 2.

Server-Sent Events enabled for Web Workers

• Enabled the EventSource interface for Web Workers
• See: W3C Server-Sent Events: Section 4 The EventSource interface