DRAFT Feature documentation for QtWebKit 2.0

NOTE: This is page is incomplete and under construction, and may contain errors at this point.

Overview

QtWebKit 2.0 is a web content engine based on the Open Source WebKit engine.

High-level list of supported standards:

• HTML 4.01
• Partial and experimental support for upcoming HTML 5
• Partial support fro XHTML Basic 1.1
• Partial support for CSS Level 2 Rev 1
• Partial and experimental support for upcoming CSS3
• JavaScript 1.5 support (ECMA-262 3rd Edition)
• Document Object Model (DOM) Level 1. Partial support for Document Object Model (DOM) Level 2 HTML Specification 1.0, Document Object Model (DOM) Level 2 Core Specification and Document Object Model (DOM) Level 0
• AJAX technologies, including XMLHttpRequest
• Partial support for SVG Tiny 1.2

As a general indicator of web compliance, QtWebKit 2.0 passes the Acid 2 and Acid 3 tests.

QtWebKit has a C++ API that allows Qt applications to embed web content, and to examine and manipulate the web content. The QtWebKit C++ API is extensively documented in the QtWebKit documentation. The C++ API documentation for QtWebKit 2.0 is included in Qt 4.7 documentation, available at ​http://doc.qt.nokia.com.

QtWebKit 2.0 is included in Qt 4.7. It can also be used with Qt 4.6 or Qt 4.5, however these cases are not covered by commercial support from Nokia. Qt 4.5 support is community driven and not verified by Nokia.

Terms used in this documentation

This documentation uses the following classification for the levels of support:

• Not implemented: implementation for the feature does not exist or is so incomplete that even validation and experimentation is not recommended
• Technology preview: the implementation of the feature is available for experimentation and validation, but not recommended for production use. The implementation may be incomplete and there may be known problems. In some cases, features that are in technology preview are disabled by default.
• Experimental: the implementation of the feature can be used in production applications with the caveat that the API, standard or the implementation may be still change in future releases, or there may be some gaps or limitations in the implementation.
• Supported: the feature is fully ready for production applications. The implementation has been verified, and we don't expect changes in the API or standard.

What's new in QtWebKit 2.0

The highlights of the QtWebKit 2.0 release are listed here

• Increased focus on performance through new performance benchmarks and benchmarking tools
• Increased focus on quality e.g. through improved automatic test coverage
• Tiling support in QGraphicsWebView, for improved scrolling and zooming performance
• Frame flattening (resize frames to fit their content to avoid separate scrollbars)
• Improvements in the NPAPI support (ongoing)
• Improvements in the native look and feel on Maemo 5
• Hybrid development: support for transporting QPixmaps between Qt C++ and WebKit, and improved documentation for hybrid C++ and QtWebKit projects
• Technology preview: Support for CSS View Modes media feature
• Technology preview: support for accelerated compositing, which enhances the performance of CSS animations and transitions
• Technology preview: JIT support on Symbian
• Technology preview (early): WebGL support

JavaScript JIT

Just-in-time (JIT) compilation for JavaScript is supported on the following platforms:

• Mac OS X, 64-bit and 32-bit
• Windows desktop platforms when using Microsoft Visual C++ or gcc 4.1 or higher (MinGW). 32-bit build only; JIT is not supported on 64-bit builds on Windows.
• Linux on x86 platforms with gcc 4.1 or higher
• Linux on ARM (Thumb-2 JIT is not currently used)
• Symbian (technology preview, not enabled by default)

Netscape Plug-in API

QtWebKit supports the Netscape Plug-in API on X11, Windows, Mac OS X and Symbian.

Advanced CSS Features

Feature	Status	Layout tests
​CSS 2D Transforms Module Level 3	Experimental, with -webkit prefix. Performance enhanced implementation with accelerated compositing in Technology Preview.	LayoutTests/transforms, LayoutTests/transforms/2d, /LayoutTests/fast/transforms, LayoutTests/fast/css
​CSS 3D Transforms Module Level 3	?	LayoutTests/transforms, LayoutTests/transforms/3d/general, LayoutTests/transforms/3d/hit-testing, LayoutTests/transforms/3d/point-mapping, LayoutTests/compositing/animation
​CSS Transitions Module Level 3	Experimental, with -webkit prefix. Performance enhanced implementation with accelerated compositing in Technology Preview.	LayoutTests/transitions, LayoutTests/fast/css, LayoutTests/compositing/transitions
​CSS Animations Module Level 3	Experimental, with -webkit prefix	LayoutTests/animations, LayoutTests/animations/3d, LayoutTests/compositing/animation
​Backgrounds and Borders Module Level 3 support	Technology preview, with -webkit prefix
​CSS Text Level 3	Not implemented
​CSS Fonts Module Level 3	Technology preview
​Styling scrollbars with CSS	Technology preview, with -webkit-scrollbar-*
​-webkit-mask-* CSS properties	Experimental, WebKit specific
​CSS Canvas drawing	Experimental, WebKit specific
​CSS reflections	Experimental, WebKit specific
​CSS View Modes Media feature	Technology preview

Web application features

Feature	Status	Qt documentation	Layout test
HTML5 Offline support: HTML5 application cache (manifest attribute)	Technology preview	​(1), ​(2) OfflineWebApplicationCacheEnabled attribute
HTML5 Offline support: Web Storage (DOM storage, local storage & session storage)	Experimental	​(1), ​(2) LocalStorageEnabled attribute	LayoutTests/storage
HTML5 Offline support: Web SQL Database	Experimental	[​(1), ​(2) OfflineStorageDatabaseEnabled attribute
HTML5 Offline support: navigator.onLine attribute, online and offline events	?
Web Workers - dedicated workers	Technology preview		LayoutTests/workers
Web Workers - shared workers	Technology preview		LayoutTests/fast/workers
HTML5 Cross-document messaging API	Technology preview
Web Sockets	Not implemented		LayoutTests/websocket

HTML5 canvas and media

Feature	Status	Layout test
<canvas> element	Experimental (partial support).	LayoutTests/fast/canvas
3D canvas support with WebGL	Technology preview (partial support)

QtWebKit has had experimental support for HTML5 media via the Phonon multimedia integration since Qt 4.5. As of QtWebKit 2.0, we have added integration to the new QtMultimedia framework in Qt 4.7. In the future, improvements and new development will focus on the QtMultimedia framework based architecture.

Feature	Status	Layout test
<audio>, <video> and <source> element	Technology preview with QtMultimedia in Qt 4.7. Also previous experimental support with Phonon still available when using Qt 4.6.	LayoutTests/media, LayoutTests/fast/media
<embed> element for embedding content such as a plug-in	?

HTML5 functionality in web forms

Feature	Status	Layout test
HTML5 input types such as email, tel, date, color	Not implemented
autofocus attribute for web form controls	Technology preview
placeholder attribute for placeholder text in an input field	Technology preview
autocomplete attribute for input values	?
maxlength attribute for text fields	?

Other new web developer APIs and HTML5 features

Feature	Status	Layout test
Geolocation API	Not implemented
W3C Selectors API	Experimental
HTML5 getElementsByClassName API	Experimental
W3C Server-sent Events	?
Multi-touch input DOM events	Technology preview
contenteditable global attribute	Experimental
<progress> progress indicator	Technology preview (which platforms? will this be enabled by default?)
<meter> an indicator for scalar measurement	Technology preview (which platforms? will this be enabled by default?)
<a rel="noreferrer"> (don't provide referrer info when following link)	?, support exist in WebKit (​http://webkit.org/blog/907/webkit-nightlies-support-html5-noreferrer-link-relation/)
HTML5 drag and drop, draggable attribute	Technology preview ?
<ruby>, <rt>, <rp> elements for Chinese notes or characters	?, support in webkit: ​http://webkit.org/blog/948/ruby-rendering-in-webkit/