Версия 10.0 является последующим развитием веб-движка Presto, который появился еще с 7ой версии, в реинкарнации 2.2.0. Сам браузер является продолжателем семейства соколиных, ведущего корни с версий 9 и 9.5, под названием Peregrine (Сапсан).
Помимо всего прочего в новой версии наконец реализована проверка орфографии, достаточно полезная фича - автообновление браузера! Так же стоит отметить, что 10-ка превосходно справляется с тестом ACID3, проходя его 100/100, что, сами понимаете, является, наилучшим результатом. Так же в Presto будет существенно улучшен почтовый клиент, уже появилась возможность создания писем в формате HTML, удаление писем с сервера через заданное количество дней и другие сюрпризы. Ко всему вышеперечисленному стоит добавить увеличение скорости на 30% за счет некоторых сервисов и реализация технологии Web Fonts в SVG

Изменения в Опере 10.0.1139 Alpha 1 по сравнению с 9.62 Build 10467 Final [внимание АЛЬФА!]

Presto

Opera 10.0 includes the Presto 2.2 rendering engine. Detailed changes since Presto 2.1.1 are listed below:

Rendering
Significant performance improvements
Added Web font support, allowing the download of fonts specified in font descriptors in @font-face at-rules; TrueType (TTF), OpenType (OTF), and SVG fonts are supported (demos)
Achieved 100/100 and pixel-perfect rendering on the Acid3 test
Pretty-printing of unstyled XML (using unstyledxml.css in the Styles sub-directory of Opera’s installation directory)
Added support for CSS3 RGBA color values (demo)
Added support for CSS3 HSLA color values (demo)
Added support for the CSS3 color: transparent value
Improved HTML5 support, including end-tag and start-tag parsing, whitespace parsing, and DOCTYPE parsing
CSS files must be served with the correct MIME type ("text/css") in Strict mode or they will be ignored

JavaScript/DOM
New regular expression engine, which greatly improves performance on regular-expression-heavy pages such as the SunSpider JavaScript Benchmark
Added support for the W3C Selectors API
Renamed the objects returned by getClientRects() and getBoundingClientRect() to ClientRectList and ClientRect instead of TextRectangle and TextRectangleList, respectively
XMLHttpRequests will now trigger start-loading/end-loading events
Removed the proprietary window.setDocument method
Added support for the SVGElement.currentFps and SVGElement.targetFps properties to read and control, respectively, SVG frames per second
The load event for scripts is now sent after the script is executed rather than before
The load event is now sent to frame/iframe/object elements before it is sent to the document
A highlight will no longer be added when HTMLElement.focus() is called unless keyboard navigation is already activated

Other
Removed UTF-32 encoding support
User JS files will now be executed in alphabetical order rather than file system order
HTML5 canvas elements can now export images to the JPEG format
HTML5 canvas transforms are applied when building a path, not when painting it (this change is made to work like Mozilla)
The first ID (instead of the last) is now used on pages with duplicate IDs when navigating to fragment IDs
Added support for the altGlyph element in SVGs
Added support for 32-bit alpha in BMP and RLE-encoded BMP images
Implemented HTML5’s algorithms for detecting charsets in HTML
The http://www.w3.org/TR/REC-html40 namespace is no longer treated as an alias to http://www.w3.org/1999/xhtml

User Interface

Auto-Update

Opera now includes the ability to automatically update itself when new releases become available. By default, Opera 10.0 Alpha 1 will simply notify the user about available updates. Users can specify that snapshots should be downloaded by enabling Download All Snapshots in opera:config. Users can also choose not to check for updates or to automatically install updates by going to Preferences > Advanced > Security and changing the "Opera update level" setting.

Inline Spelling Checker

Spelling errors are now indicated as you type via a red underline in input fields, Opera Mail, and Notes. The input field context menu includes spelling suggestions, as well as the ability to enable/disable the spelling checker and change dictionary languages. Opera 10.0 Alpha 1 includes a U.S. English dictionary. Only multi-line edit fields check spelling automatically by default.

Opera 10.0 uses the Hunspell dictionary format. Installing dictionaries will become easier before Opera 10.0 is released, but additional dictionaries can be downloaded and installed now by copying the dictionary files (*.aff and *.dic) to the local dictionary directory. Opera will recognize the additional dictionaries after restarting. The dictionary directory locations for each platform are listed below:
Windows: $PROFILEdictionaries (where $PROFILE is the ‘Opera directory’ in opera:about)
Linux/UNIX: $PROFILE/dictionaries/ (where $PROFILE is the ‘Opera directory’ in opera:about)
Mac: ~/Library/Application Support/Opera 10/Dictionaries/

Mail/News

Rich Text Message Composition

Opera Mail can now send rich text messages including inline images, styled text, links, and/or custom HTML. Forwarding and redirecting rich text messages now also works as expected. Rich text composition can be enabled by default for an account on the Outgoing tab of the account settings dialog by checking "Prefer HTML formatting". It can also be enabled on a per message basis in the message composition window.

Bold styling, italic styling, and underline styling can be toggled using Ctrl-B, Ctrl-I, and Ctrl-U, respectively.

Rich text message signatures are not yet supported.

Delete After X Days (POP-only)

Delete after X days automatically removes messages from POP servers after the specified number of days, which is particularly useful for users who have limited server space. This option can be enabled for POP accounts on the Incoming tab of the account settings dialog by checking "Remove from server after #days" (7 days by default). It’s also possible to specify that only read messages and/or only fully downloaded messages should be removed.

Warning: Disabling the latter option is dangerous for those that use low-bandwidth mode, as messages that aren’t completely downloaded will be removed from the server, making it impossible to retrieve the complete message.

Other Changes
When viewing a message, message subjects are now a text field again instead of a button
Added a Thread button to the message list toolbar
Added keyboard shortcuts for Go to Thread (D), Watch Thread (Ctrl-D), and Ignore Thread (Ctrl-Shift-D)
The encoding mismatch dialog has been removed

Miscellaneous
Network access for widgets is now opt-in. Thus, all existing widgets must be updated in order to have network access. All widgets on widgets.opera.com have been given Internet access. Network access is specified using the network attribute of the widget element. For instance, widgets that use will have Intranet access only. Widgets that use will have Intranet and Internet access.
Dragonfly now selects the current tab automatically
Dragonfly now includes an HTTP inspector
Added support for TLS 1.2
SSL v2 and weak cipher support have been completely removed
Fixed numerous stability issues
Plugged numerous memory leaks

http://rapidshare.com/files/176480988/o100a1_1139m.exe