Microsoft Silverlight

Microsoft Silverlight (or simply Silverlight) is a deprecated[5] application framework for writing and running rich Internet applications, similar to Adobe Flash. A plugin for Silverlight is still available for some browsers. While early versions of Silverlight focused on streaming media, later versions supported multimedia, graphics, and animation and gave developers support for CLI languages and development tools. Silverlight was also one of the two application development platforms for Windows Phone, but web pages that use Silverlight did not run on the Windows Phone or Windows Mobile versions of Internet Explorer, as there was no Silverlight plugin for Internet Explorer on those platforms.[6]

Microsoft Silverlight
Silverlight Logo
Developer(s)Microsoft Corporation
Initial releaseSeptember 5, 2007
Final release5.1.50918.0[1] (January 15, 2019) [±]
Preview releaseNone [±]
Operating systemMicrosoft Windows, macOS, and Symbian OS[2][3]
PlatformIA-32 and x86-64[4]
TypeApplication framework, run-time environment and multimedia framework



From the initial launch in 2007, reviewers compared the product to Adobe's Flash.[7][8]


According to, Microsoft Silverlight had a penetration of 64.2% in May 2011. Usage on July 2010 was 53.6%, whereas as of May 2011 market leader Adobe Flash was installed on 95.3% of browsers, and Java was supported on 76.5% of browsers.[9] Support of these plugins is not mutually exclusive; one system can support all three. Not all Web sites require a browser plugin.

Silverlight was used to provide video streaming for the NBC coverage of the 2008 Summer Olympics in Beijing,[10] the 2010 Winter Olympics in Vancouver,[11] and the 2008 conventions for both major United States political parties.[12] Silverlight was also used by Amazon Video and Netflix for their instant video streaming services,[13][14] but Netflix said in its Tech Blog in 2013 that, since Microsoft had announced Silverlight's end-of-life, they would be moving to HTML5 video.[15]


Industry observers were announcing the death of Silverlight as early as 2011,[16] Internally, even proponents of the technology thought Extensible Application Markup Language as a concept was a bad idea from the start.[17]

In 2012 Microsoft deprecated Silverlight for HTML5 in Windows 8,[17] - but as late as the beginning of 2015 it was not clear what Microsoft's official position was on the future for Silverlight as a technology.[18]

In July of 2015 a Microsoft blog post finally clarified matters: "...we encourage companies that are using Silverlight for media to begin the transition to DASH/MSE/CENC/EME based designs".[5] Microsoft has set the overall support end date for Silverlight 5 to be October 2021.[19] Support for IE7-8 was removed between 2014 and 2016, depending on the OS[20]. Support for IE9-11 will last until late 2021, depending on the OS [20], "or though [sic] the support lifecycle of the underlying browsers[21], whichever is shorter."[19] There is no Silverlight plugin available for Microsoft Edge.[5][20]. It is no longer supported by Google Chrome since September 2015,[20][22] and by Firefox since March 2017[23] (although it wasn't supported by Microsoft since December 2016[20]).

As of February 2018, fewer than 0.1% sites used Silverlight,[24] 5.3% used Adobe Flash,[25] and 2.4% used Java.[26]


Silverlight provides a retained mode graphics system similar to Windows Presentation Foundation (WPF), and integrates multimedia, graphics, animations, and interactivity into a single run-time environment. In Silverlight applications, user interfaces are declared in Extensible Application Markup Language (XAML) and programmed using a subset of the .NET Framework. XAML can be used for marking up the vector graphics and animations. Silverlight can also be used to create Windows Sidebar gadgets for Windows Vista.[27]

Silverlight supports H.264 video,[28] Advanced Audio Coding, Windows Media Video (WMV), Windows Media Audio (WMA), and MPEG Layer III (MP3) media content[29] across all supported browsers without requiring Windows Media Player, the Windows Media Player ActiveX control, or Windows Media browser plug-ins. Because Windows Media Video 9 is an implementation of the Society of Motion Picture and Television Engineers (SMPTE) VC-1 standard, Silverlight also supports VC-1 video. According to the end user license agreement VC-1 and H.264 are only licensed for the "personal and non-commercial use of a consumer".[30] Silverlight makes it possible to dynamically load Extensible Markup Language (XML) content that can be manipulated through a Document Object Model (DOM) interface, a technique that is consistent with conventional Ajax techniques. Silverlight exposes a Downloader object which can be used to download content, like scripts, media assets, or other data, as may be required by the application.[31] With version 2, the programming logic can be written in any .NET language, including some derivatives of common dynamic programming languages like IronRuby and IronPython.[32]

A free software implementation (now abandoned)[33] named Moonlight, developed by Novell in cooperation with Microsoft, was released to bring Silverlight versions 1 and 2 functionality to Linux, FreeBSD, and other open source platforms, although some Linux distributions did not include it, citing redistribution and patent concerns.[34] However, in May 2012, Moonlight was abandoned because of its lack of popularity.[35]

Supported platforms

Over the course of about five years Microsoft released five versions with varying platform support: The first version was released in 2007; and the fifth (and final) major version on May 8, 2012. It is compatible with later versions of Internet Explorer web browser on Microsoft Windows (except Windows RT) operating systems,[36] with Safari on Apple macOS, and with mobile devices using the Windows Mobile[37] and Symbian (Series 60)[38] platforms.

Cross platform Mozilla Firefox support for Silverlight was removed in Firefox 52 released in March 2017 when Mozilla removed support for NPAPI plugins,[39][40] bringing it in-line with the removal of NPAPI plugin support in Google Chrome.[41][42]

Desktop computers

Silverlight requires an x86 processor with Streaming SIMD Extensions (SSE) support. Supported processors include the Intel Pentium III and up, the AMD Athlon XP and up, and newer AMD Durons.

The following table presents an availability and compatibility matrix of Silverlight versions for various operating systems and web browsers.

Color-coding guide for the following table
This version of Silverlight is currently supported on the given platform + browser combination.
Silverlight support on the given platform + browser combination has expired.
No Silverlight version has ever been supported on the given platform + browser combination.
The given platform + browser combination does not exist.
Supported Silverlight versions by desktop platform[43][44][45]
Web browser Internet Explorer 6 SP1 or later Internet Explorer 7 Internet Explorer 8 and 9 Internet Explorer 10 Internet Explorer 11 Firefox Safari Chrome Edge Opera
Windows 10 N/A N/A N/A N/A 5 None, since Firefox 52[40][46] 1, 2 None, since Chrome 45[41][42] None None[47]
Windows 8.1 N/A N/A N/A N/A 5 None, since Firefox 52 1, 2 None, since Chrome 45 N/A None
Windows 8 N/A N/A N/A 5 N/A None, since Firefox 52 1, 2 None, since Chrome 45 N/A None
Windows 7 or later
Windows Server 2008 R2 or later
N/A N/A 1, 2, 3, 4, 5 None 5 None, since Firefox 52 1, 2 None, since Chrome 45 N/A None
Windows Vista
Windows Server 2008
N/A 1, 2, 3, 4, 5 1, 2, 3, 4, 5 N/A N/A None, since Firefox 52 1, 2 None, since Chrome 45 N/A None
Windows XP
Windows Server 2003
1, 2, 3, 4 1, 2, 3, 4, 5 1, 2, 3, 4, 5 N/A N/A None, since Firefox 52 1, 2 None, since Chrome 45 N/A None
Windows 2000
(KB891861 required)
2, 3, 4 N/A N/A N/A N/A N/A 2 N/A N/A None
macOS (Intel) N/A N/A N/A N/A N/A None, since Firefox 52 None, since Safari 12 None, since Chrome 45 N/A None
Ubuntu Linux N/A N/A N/A N/A N/A None, since Firefox 52 N/A None, since Chrome 45 N/A None

Support for Opera was promised since May 3, 2007, when David Storey, the Chief Web Opener at Opera, revealed a Microsoft poster for MIX conference that had shown Opera integration as a part of Silverlight 1.1.[48] However, Opera was never officially supported by Silverlight.

On Linux and FreeBSD, the functionality was available via Moonlight and Pipelight,[49][50], though both projects have been discontinued. Moonlight is available for the major Linux distributions, with support for Firefox, Konqueror, and Opera browsers, provided it was obtained through Novell.[51] Miguel de Icaza has expressed an interest in working with developers from other operating systems (BSD, Solaris) and other browsers (Konqueror, WebKit and Opera) to ensure that Moonlight works fine on their systems.[52] Availability of Moonlight version 1.0 for FreeBSD was announced in March 2009,[53] but has since been reported not to actually work.[54] As of 2011, the current version of Moonlight (4 Preview 1) does not officially work on new versions of Firefox (newer than 3.x) on GNU/Linux-based operating systems. However, it can be installed in an unofficial way (for example using the Add-on Compatibility Reporter add-on) and with Firefox 11 it works correctly when installed. As noted above, the Moonlight project was abandoned in May 2012.

A browser plugin named Pipelight used to provide Silverlight access. Pipelight requires browser support for NPAPI plugins, which newer versions of Firefox, Chrome, and Opera have dropped. As of 2018, the Pipelight project has been discontinued.[55]

Mobile devices

As of 2015, Silverlight was not available on Android or iOS, the most prevalent operating systems on the mobile market.

Silverlight was the primary development environment for Windows Phone and is based on Silverlight 4. For previous versions of Windows Mobile, the first Community Technology Preview (CTP) for Windows Mobile 6 was expected in the second quarter of 2008, but it still has not been officially announced. Microsoft has stopped focusing on bringing Silverlight to Windows Mobile 6.x.[56] Nokia announced plans to make Silverlight for Mobile available for S60 on Symbian OS, as well as for Series 40 devices and Nokia internet tablets[57][58] (while it later sold the business to Microsoft and now sells Android tablets and will sell Alcatel-Lucent branded smartphones). Silverlight for Mobile supports Silverlight 2 content and .NET languages.[37] Silverlight for Windows Phone 7.5 is based on Silverlight 4.[59]

Development tools

Visual Studio, editing a Silverlight project
A Silverlight application being edited in Microsoft Visual Studio.

Silverlight applications could be written in any .NET programming language. As such, any development tools which can be used with .NET languages can work with Silverlight, provided they can target the Silverlight CoreCLR for hosting the application, instead of the .NET Framework CLR. Microsoft has positioned Microsoft Expression Blend as a companion tool to Visual Studio for the design of Silverlight User Interface applications. Visual Studio can be used to develop and debug Silverlight applications. To create Silverlight projects and let the compiler target CoreCLR, Visual Studio requires the Silverlight Tools for Visual Studio.[60]

A Silverlight control is a ZIP format file with extension .XAP containing a list of one or more .NET managed assemblies (.DLL files) along with the AppManifest.XAML file containing this list along with the entry point (class and assembly). It can be hosted in any HTML file using an object tag, for example:

<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
  <param name="source" value="MySilverLightControl.xap"/>

A Silverlight project contains the Silverlight.js and CreateSilverlight.js files which initializes the Silverlight plug-in for use in HTML pages, a XAML file for the UI, and code-behind files for the application code. Silverlight applications are debugged in a manner similar to ASP.NET applications. Visual Studio's CLR Remote Cross Platform Debugging feature can be used to debug Silverlight applications running on a different platform as well.[61]

In conjunction with the release of Silverlight 2, Eclipse was added as a development tool option.[62]


An April 2007 PC World report suggested that Microsoft intended to release certain parts of Silverlight source code as open source software,[63] but a week later Sam Ramji, director of platform technology strategy at Microsoft, contradicted the rumors by confirming that the company had no plans to open Silverlight.[64] Some controls that ship with Silverlight are available under the Microsoft Public License as a part of a separate project known as the Silverlight Toolkit.[65]

Silverlight's proprietary nature is a concern to competition since it may harm the open nature of the World Wide Web. Advocates of free software are also concerned Silverlight could be another example of Microsoft's embrace, extend and extinguish strategy.[66] Both Microsoft Silverlight and Adobe Flash are proprietary.[67] Flash's file formats are publicly documented standards,[68][69] as are Silverlight's.[70][71] Silverlight, like other web technologies, uses patent-encumbered audio and video codecs.

Mono Moonlight implementation

The Mono Team abandoned development of Moonlight, a free and open-source implementation of both the Silverlight 1 and 2 runtimes.[72] Development was discontinued in 2012 due to the poor acceptance of Silverlight and the restrictions imposed by Microsoft.[73]

The project had been officially supported by Microsoft which,[49] under an agreement with Novell, made not-publicly-available additional specifications, access to the Silverlight Base Class Library APIs, binary codecs and test cases available to the Mono team.[50][74]

The "covenant" under which Novell was granted this exclusive access also specified conditions incompatible with the licensing that covers most free and open source software. As examples, it specifically required that the software must have been "obtained directly from Novell or through an Intermediate Recipient" and that it must be "not licensed under GPLv3 or a Similar License".[51] Some free software proponents criticized the covenant.[75]

Silverlight was criticised for not living up to its cross-platform operating system compatibility promises, especially on Linux systems, compared to its extensive support on Apple and Microsoft desktops for Internet Explorer, Firefox, and Chrome. Although Microsoft was officially collaborating on the Moonlight project, Bruce Chizen, CEO of Adobe Systems, which sells the competing proprietary Flash platform, questioned "the commitment of Microsoft to keep the Silverlight platform compatible with other OS besides Windows".[76] His concerns are based on "examples from history" where he said that Microsoft had launched products with promises of ongoing cross-platform compatibility that no longer apply, for example Internet Explorer for UNIX and Windows Media Player for Mac.

Relationship to existing web standards

In 2007, California and several other U.S. states asked a district judge to extend most of Microsoft's antitrust case settlement for another five years,[77] citing "a number of concerns, including the fear that Microsoft could use the next version of Windows to 'tilt the playing field' toward Silverlight, its new Adobe Flash competitor," says a Seattle Post-Intelligencer article. The final judgment on the motion extended the settlement two years, to November 2009, but for reasons unrelated to Silverlight.[78]

Version history

  • Silverlight 1 – Silverlight 1, developed under the codename Windows Presentation Foundation/Everywhere (WPF/E[79]) was released in 2007. It consisted of the core presentation framework, which is responsible for the user interface (UI), interactivity and user input, basic UI controls, graphics and animation, media playback, Digital rights management (DRM), and DOM integration.
  • Silverlight 2 – Included a version of the .NET Framework, implemented the same full Common Language Runtime (CLR) version as .NET Framework 3.0; so it can execute programs written in any .NET language.
  • Silverlight 3 – Silverlight 3 was announced on September 12, 2008, and unveiled at MIX09 in Las Vegas on March 18, 2009.[80] A beta version was made available for download the same day. The final version was released July 9, 2009. Silverlight 3 included more controls[81]—including DataGrid, TreeView, various layout panels, DataForm for forms-driven applications and DataPager for viewing paginated data.
  • Silverlight 4 – On November 18, 2009, at the Professional Developers Conference in Los Angeles, Microsoft Corporation unveiled a Beta version of Silverlight 4.[82] The final version was released on April 15, 2010 (along with Silverlight 4 tools for developers). New features in Silverlight 4 include: Support for Google's Chrome browser, webcam and microphone, printing, more mouse support, new notification support to send messages to users, new and enhanced controls (e.g., RichTextBox, DataGrid), theming of controls, rendering HTML, better localization, etc....
  • Silverlight 5 – The official release was made available to download officially on December 9, 2011.[83] New features included GPU accelerated video decoding, 3D graphics, playback speed controls, remote control, and 64-bit support.[83]

See also


  1. ^ "Microsoft Silverlight Release History". Microsoft Corporation. Retrieved January 15, 2019.
  2. ^ "Frequently Asked Questions § System requirements". Microsoft Silverlight product page. Microsoft Corporation. Retrieved November 4, 2010.
  3. ^ Perez, Sarah (March 22, 2010). "Silverlight for Symbian Plugin Now Available". Cool Stuff – A Channel 9 Blog. Microsoft Corporation. Retrieved November 4, 2010.
  4. ^ "Get Silverlight | Microsoft Silverlight > System Requirements". Microsoft Corporation. Retrieved March 1, 2016.
  5. ^ a b c Smith, Jerry (July 2, 2015). "Moving to HTML5 Premium Media - Microsoft Edge Dev Blog". Retrieved October 1, 2018. we encourage companies that are using Silverlight for media to begin the transition to DASH/MSE/CENC/EME based designs
  6. ^ internet explorer – Can I browse Silverlight sites on Windows Phone 7? – Windows Phone Beta – Stack Exchange
  7. ^ Anderson, Tim (October 27, 2008). "Silverlight 2.0: killer features, no Flash killer". The Register. Retrieved February 4, 2019.
  8. ^ Schofield, Jack (April 16, 2007). "Microsoft launches Silverlight -- formerly WPF/E -- to compete with Flash". The Guardian. Retrieved February 4, 2019.
  9. ^ "Rich Internet Application Market Share" (Flash player). Retrieved July 24, 2011.
  10. ^ "Microsoft Silverlight Gets a High Profile Win: 2008 Beijing Olympics". Retrieved February 23, 2010.
  11. ^ "Microsoft Wins The 2010 Olympics For Silverlight". Retrieved February 23, 2010.
  12. ^ "Microsoft Working to Make Political Conventions Unconventional". Archived from the original on May 19, 2010. Retrieved February 23, 2010.
  13. ^ " Help: System Requirements for Streaming on Your Computer". Retrieved July 18, 2015.
  14. ^ "Netflix Begins Roll-Out of 2nd Generation Media Player for Instant Streaming on Windows PCs and Intel Macs". Archived from the original on May 29, 2010. Retrieved February 23, 2010.
  15. ^ "HTML5 Video at Netflix". Retrieved October 1, 2018.
  16. ^ "Former Microsoft PM: "Silverlight is Dead"". Neowin. September 13, 2011. Retrieved February 4, 2019.
  17. ^ a b "Why Silverlight was destined to fail and my time as one of its custodians". Scott Barnes. Retrieved August 20, 2017.
  18. ^ James, Mike (January 9, 2015). "Microsoft Needs To Make Silverlight's Future Clear". Retrieved February 5, 2019.
  19. ^ a b "Search product lifecycle (Silverlight)". Retrieved October 1, 2018.
  20. ^ a b c d e "Silverlight 5 System Requirements". Retrieved October 1, 2018.
  21. ^ "Lifecycle FAQ—Internet Explorer". Retrieved October 1, 2018. Beginning January 12, 2016, only the most current version of Internet Explorer available for a supported operating system receives technical support and security updates
  22. ^ "The Final Countdown for NPAPI". Retrieved October 1, 2018.
  23. ^ "Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work?". Mozilla. Retrieved March 17, 2017.
  24. ^ "Usage of Silverlight for websites". W3Techs Technology Surveys. Q-Success. Retrieved February 19, 2018.
  25. ^ "Usage of Flash for websites". W3Techs Technology Surveys. Q-Success. Retrieved February 19, 2018.
  26. ^ "Usage statistics and market share of Java for websites". W3Techs Technology Surveys. Q-Success. Retrieved February 19, 2018.
  27. ^ Sterling, Charles. "Writing a Windows Sidebar Gadget in Silverlight dead simple". MSDN Blogs. Retrieved March 9, 2008.
  28. ^ "Discussed on Microsoft's web site in Q&A with Scott Guthrie".
  29. ^ "Silverlight FAQs". Retrieved October 6, 2012.
  30. ^ "windows phone software".
  31. ^ "Using a Downloader Object". Retrieved May 25, 2007.
  32. ^ "Mono developers to bring Silverlight to Linux". May 7, 2007.
  33. ^
  34. ^ "Forbidden items — FedoraProject".
  35. ^ Miguel de Icaza on ASP.NET MVC, Moonlight, and the Android Lawsuit
  36. ^ Microsoft: Silverlight 5 System Requirements – Compatible Operating systems and browsers
  37. ^ a b "FAQ: Silverlight for mobile". Archived from the original on March 9, 2008. Retrieved March 9, 2008.
  38. ^ "Announcing Silverlight for Symbian – RTM – Silverlight for Symbian Team Blog – Site Home – MSDN Blogs". July 6, 2010. Archived from the original on March 2, 2013. Retrieved June 15, 2013.
  39. ^ "NPAPI Plugins in Firefox". October 8, 2015. Retrieved December 13, 2015.
  40. ^ a b "Plug-in support has been dropped other than Flash". Firefox Site Compatibility. October 4, 2016. Retrieved March 8, 2017.
  41. ^ a b "NPAPI deprecation: developer guide". Retrieved December 13, 2015.
  42. ^ a b "The Final Countdown for NPAPI". November 24, 2014. Retrieved December 13, 2015.
  43. ^ "Get Silverlight | Microsoft Silverlight". Retrieved June 15, 2013.
  44. ^
  45. ^ "Silverlight 5 System Requirements". Retrieved March 31, 2018.
  46. ^ "Remove support for all NPAPI plugins (except Flash)". Retrieved March 7, 2017.
  47. ^ "Microsoft: Silverlight 5 System Requirements – Compatible Operating systems and browsers". Microsoft. Retrieved December 24, 2017.
  48. ^ "Opera Watch: More details on Silverlight support in Opera, 3 May 2007". Archived from the original on July 21, 2011. Retrieved May 2, 2007.CS1 maint: BOT: original-url status unknown (link)
  49. ^ a b "Silverlight 1.0 Released and Silverlight for Linux Announced". Retrieved September 5, 2007.
  50. ^ a b "Microsoft/Novell Collaboration on Silverlight". Retrieved September 5, 2007.
  51. ^ a b "Covenant to Downstream Recipients of Moonlight – Microsoft & Novell Interoperability Collaboration". Microsoft. September 28, 2007. Retrieved March 8, 2008. “Downstream Recipient” means an entity or individual that uses for its intended purpose a Moonlight Implementation obtained directly from Novell or through an Intermediate Recipient… Microsoft reserves the right to update (including discontinue) the foregoing covenant… “Moonlight Implementation” means only those specific portions of Moonlight 1.0 or Moonlight 1.1 that run only as a plug-in to a browser on a Personal Computer and are not licensed under GPLv3 or a Similar License.
  52. ^ "Microsoft/Novell Collaboration on Silverlight". Miguel de Icaza. September 5, 2007. Retrieved November 9, 2008. We will be supporting Firefox and Linux initially (that is our first goal) but we are looking forward to work with developers from other operating systems (BSD, Solaris) and other browsers (Konqueror, WebKit and Opera) to ensure that Moonlight works fine on their systems.
  53. ^ "Moonlight 1.0 for FreeBSD availability announcement". March 5, 2009.
  54. ^ "Installation and Maintenance of FreeBSD Ports or Packages".
  55. ^ "Pipelight". Arch Linux Wiki. Retrieved March 31, 2018.
  56. ^ Chapman, Stephen (December 1, 2009). "Windows Mobile 7: Silverlight Applications, IE Mobile 7, and More!". Archived from the original on February 10, 2010.
  57. ^ "Nokia to enable Silverlight". March 4, 2008. ISSN 1797-1993. Archived from the original on June 15, 2013. Retrieved March 4, 2008.
  58. ^ "Windows Phone Silverlight Application Life Cycle". MSDN. Microsoft Corporation. November 19, 2010. Retrieved August 26, 2011. Version 1.0; Applies To: Windows® Phone 7
  59. ^ "What's New in Silverlight for Windows Phone". MSDN. Microsoft Corporation. Retrieved August 26, 2011. Silverlight for Windows Phone OS 7.1 is based on Silverlight 4. That means if you create a new Silverlight for Windows Phone application that targets Windows Phone OS 7.1, you can take advantage of several new features.
  60. ^ "Microsoft Silverlight Tools for Visual Studio". Retrieved January 22, 2009.
  61. ^ Parker, Nigel. "MIX07 Your Product is a feature of the Web!". Retrieved June 8, 2007.
  62. ^ "Eclipse for Silverlight". Retrieved October 14, 2008.
  63. ^ Montalbano, Elizabeth. "Microsoft Goes Open Source?". Retrieved April 29, 2007.
  64. ^ Clarke, Gavin. "Silverlight glow dimmed by cross-platform concerns". Retrieved May 5, 2007.
  65. ^ "Sample Source Code for Silverlight 2 Runtime and SDK Controls".
  66. ^ Markoff, John (August 11, 2008). "Microsoft leveraging Silverlight and riling critics". International Herald Tribune. Retrieved January 11, 2009. Others take a darker view of Microsoft's intentions and argue that Silverlight is simply a rehash of the company's 1990s-era "embrace and extend" strategy for pre-empting Web competition. "They're still playing the same games," said Michael Nelson, professor of internet studies at Georgetown University. "It's a way to lock up the content, and it's not enabling as much innovation as we would like to see."
  67. ^ Meyer, David (April 30, 2008). "Mozilla warns of Flash and Silverlight 'agenda'". ZDNet. Archived from the original on December 27, 2008. Retrieved January 11, 2009. Companies building websites should beware of proprietary rich-media technologies like Adobe's Flash and Microsoft's Silverlight, the founder of Mozilla Europe has warned.
  68. ^ "Adobe SWF file format specification" (PDF). Retrieved December 11, 2011.
  69. ^ "Adobe FLV file format specification" (PDF). Adobe Systems Inc. Archived from the original (PDF) on May 31, 2010. Retrieved December 11, 2011.
  70. ^ "Microsoft Open Specification Promise". Retrieved December 11, 2011.
  71. ^ "Microsoft ASF specification". Retrieved December 11, 2011.
  72. ^ "Mono Moonlight". Mono Project. Retrieved June 22, 2008.
  73. ^ Miguel de Icaza (May 29, 2012). "Moonlight development discontinued". Retrieved June 4, 2012.
  74. ^ Miguel de Icaza (March 3, 2008). "Pre-Mix 08: Moonlight Updates". Retrieved March 8, 2008.
  75. ^ Jones, Pamela (May 28, 2008). "Shining Some Light on Microsoft's Moonlight Covenant". Groklaw. Retrieved August 25, 2008. Moonlight is safe from threat only if you get it from Novell AND DO NOT PASS IT ON, as there are no protections for downstream recipients...Unless those downstream recipients get it from an 'Intermediate Recipient' defined to only include authorized resellers...It's like walking into a store and saying "I'm only going to pay half of the amount I owe and I hereby disclaim my duty to pay full price." You can try that, but the law supersedes whatever intent or desire you've expressed. At minimum, this shows how clearly they DO NOT want to coexist with GPL'd code.
  76. ^ Chhabra, Gautam (April 20, 2007). "Adobe CEO questions Microsoft Silverlight cross-platform commitment". Java Entrepreneur. Archived from the original on December 20, 2007. Retrieved December 6, 2007.
  77. ^ Bishop, Todd (October 17, 2007). "Antitrust filing cites Microsoft Silverlight concern". Seattle Post-Intelligencer. Retrieved December 6, 2007.
  78. ^ "Anitrust motion Executive Summary" (PDF). Archived from the original (PDF) on September 11, 2008. Retrieved September 7, 2008.
  79. ^
  80. ^ Fried, Ina. "Microsoft hopes users see the (Silver) light". Retrieved June 18, 2013.
  81. ^ Heuer, Tim. "A guide to Silverlight 3 new features". Retrieved March 23, 2009.
  82. ^ "Silverlight 4 Beta What's New". Retrieved January 21, 2010.
  83. ^ a b "Silverlight 5 has released! The docs are up and a .chm is available". MSDN blogs. Microsoft Corporation. December 9, 2011. Retrieved December 11, 2011.

External links

Cinder (programming library)

Cinder is an open-source programming library designed to give the C++ language advanced visualization abilities. It was released as a public tool in spring 2010 and can be viewed in many ways as a C++-based alternative to tools like the Java-based Processing library, Microsoft Silverlight or Adobe Flash. It is also comparable to the C++ based openFrameworks; the main difference is that Cinder uses more system-specific libraries for better performance while openFrameworks affords better control over its underlying libraries.

Unlike Flash and Silverlight, Cinder is generally used in a non-browser environment. This, combined with the speed provided by C++, makes the library more appropriate for heavily abstracted projects, including art installations, commercial campaigns and other advanced animation work.

Encrypted Media Extensions

Encrypted Media Extensions (EME) is a W3C specification for providing a communication channel between web browsers and digital rights management (DRM) agent software. This allows the use of HTML5 video to play back DRM-wrapped content such as streaming video services without the use of heavy third-party media plugins like Adobe Flash or Microsoft Silverlight. The use of a third-party key management system may be required, depending on whether the publisher chooses to scramble the keys.

EME is based on the HTML5 Media Source Extensions specification, which enables adaptive bitrate streaming in HTML5 using e.g. MPEG-DASH with MPEG-CENC protected content.EME has been highly controversial because it places a necessarily proprietary, closed component into what might otherwise be an entirely open and free software ecosystem. On July 6th, 2017, W3C publicly announced its intention to publish EME web standard, and did so on September 18th. On the same day, the Electronic Frontier Foundation published an open letter resigning from W3C.


Film4oD was a UK based video on demand service for Film4, from Channel Four Television Corporation and FilmFlex. Film4oD officially launched on 1 November 2010, following two years of development by FilmFlex, with more than 500 films available at launch. Film4oD has more new releases available to rent than iTunes, LoveFilm or Blinkbox, with many films available on the same day as DVD release and some on the same day as cinema release.Films are available for 48-hour rental and are streamed online using Microsoft Silverlight requiring a minimum broadband speed of 2 Mbit/s. A download-to-rent option was added on 26 September 2011, allowing films to be watched while offline.

JavaFX Script

JavaFX Script was a scripting language designed by Sun Microsystems, forming part of the JavaFX family of technologies on the Java Platform.

JavaFX targeted the Rich Internet Application domain (competing with Adobe Flex and Microsoft Silverlight), specializing in rapid development of visually rich applications for the desktop and mobile markets. JavaFX Script works with integrated development environments such as NetBeans, Eclipse and IntelliJ IDEA. JavaFX is released under the GNU General Public License, via the Sun sponsored OpenJFX project.

Line Rider

Line Rider is an internet game, with versions available for Microsoft Silverlight and Flash. It was originally created in September 2006 by Boštjan Čadež (also known as "fšk"), a Slovenian student. Originally appearing on DeviantArt on September 23, 2006, Line Rider quickly became an internet phenomenon.

Line Rider was featured by several websites, such as Yahoo!, but is mainly used on the website, Time Magazine's website and has appeared in several McDonald's commercials for the Snack Wrap in 2008. Line Rider was also selected by staff and voted by users as the Best Webtoy of 2006 in the Jay is Games polls. A two-page article about the game was published in Games for Windows: The Official Magazine.

Live Connect

Live Connect (previously Messenger Connect, Live Services and Windows Live Dev) is a collection of APIs and common controls that allow developers to have a deeper control and offers access to the core Windows Live services and data through open and easily accessible application programming interfaces (APIs). At MIX07, Microsoft's Senior Architect Danny Thorpe described:

Live Connect is built on standard web technologies such as OAuth 2.0, Representational State Transfer (REST), and JavaScript Object Notation (JSON), and is designed to work with any technology or device including ASP.NET, Microsoft Silverlight (in-browser and out-of-browser models), Windows Presentation Foundation (WPF), Adobe Flash, PHP, and Java.Live Connect was released on June 24, 2010 as part of Windows Live's "Wave 4" release (known then as Messenger Connect), and unites previously separate APIs of Windows Live (Windows Live ID, Windows Live Contacts, Windows Live Messenger Web Toolkit, and others) into a single API that is based on industry standards and specifications. On September 13, 2011, Messenger Connect was renamed to Live Connect and brings additional APIs for OneDrive and Outlook contacts and calendars as well as adding XMPP support for the Messenger service.


Maqetta is a free and open-source, web-based WYSIWYG HTML editor designed to edit HTML5 documents and web applications. Its name is derived from the Spanish word maqueta, that means “mock-up”. The Maqetta application itself is authored in HTML, and therefore runs in the browser, without requiring additional plugins or downloads.

As of May 2013, active development of Maqetta has stopped.Maqetta was developed by IBM and later donated to the Dojo Foundation as an open-source project under the terms of either the modified (revised) BSD license or the Academic Free License (= 2.1).

The editor was developed in response to a perceived need for open-source HTML5 programming tools equivalent in capability to those available for Adobe Flash and Microsoft Silverlight.The downloadable server component can run on a remote server or on the same computer as the client software (the web browser).

Microsoft Expression Encoder

Microsoft Expression Encoder (formerly Expression Media Encoder) is a transcoding and non-linear video editing software application for Microsoft Windows. It can create video streams for distribution via Microsoft Silverlight. This utility is created to record the screen for various purposes like YouTube, Twitch , Sharing etc.

Microsoft Popfly

Microsoft Popfly (internally codenamed Springfield) was a Web site that allowed users to create web pages, program snippets, and mashups using the Microsoft Silverlight rich internet applications runtime and the set of online tools provided. It was discontinued on August 24, 2009.

Microsoft Silverlight version history

Microsoft Silverlight is an application framework for writing and running rich internet applications that was actively developed and marketed by Microsoft from 2007 to 2012. This is a technical overview of the platform's history.


QTRAX is an ad-supported digital music service that provides Downloads, Streaming and Radio via Mac and PC (and on Android and iOS from February 2015). The New York-based company now holds license agreements with a number of major and independent labels. CEO Allan Klepfisz has stated that maintaining compensation for copyright holders while capturing part of the 95 percent marketshare that continues to download music illegally is the ambition behind Qtrax's current model.

QTRAX plans to launch new Mobile Apps (for iOS and Android) to provide Free Streaming, Free Downloads, Free Radio. QTRAX launched a new initiative, the ARTIST MANIFESTO, on 27 January 2015, aimed at providing music artists with better compensation for digital music consumed via its (and others) digital music services.

QTRAX currently allows music fans to download free and legal music (Download, Stream, Radio) with a selection of millions of tracks from major labels. The Qtrax Player client has been created on the Microsoft Silverlight Platform. The service is totally free to use with registration and generates revenue by a combination of advertising and strategic partnerships. Qtrax value-added service includes band pages complete with links to YouTube videos, Ticketmaster ticket searches, Amazon purchase links, and a Wikipedia link. Users can interact socially by creating playlists and sending music recommendations to friends.The files utilize Microsoft's Windows Media Digital Rights Management. This platform ensures the ad-supported application continues to offer free access to music files.

Rich web application

A rich web application (originally called a Rich Internet Application RIA or Installable Internet Application) is a Web application that has many of the characteristics of desktop application software, typically delivered by way of a site-specific browser, a browser plug-in, an independent sandbox, extensive use of JavaScript, or a virtual machine. The concept is closely related to a single-page application, and may allow the user interactive features such as drag and drop, background menu, WYSIWYG editing, etc. HTML5 is a current standard for delivering rich web applications, supported by all major browsers.

Silverlight (disambiguation)

Silverlight may refer to:

Microsoft Silverlight, a web browser plugin that provides support for rich internet applications such as animation, vector graphics and audio-video playback.

Terry Silverlight, American musician

Sky Go

Sky Go (formerly known as Sky Player, Sky Anytime on PC and Sky By Broadband) is an online television service from Sky which launched in January 2006. The service allows users to watch live and on demand video content from their Mac, Windows PC, mobile phone, Xbox 360, Xbox One, PlayStation 3 or PlayStation 4 via a broadband or Wi-Fi internet connection. On demand content comprises sports highlights, latest news, movies and TV programmes. Content is viewable for a limited amount of time and is protected by digital rights management software provided by Microsoft and the NDS Group, and therefore cannot be copied to disc or viewed beyond the date carried by its license. The service is available at no extra cost to existing Sky TV customers, with accessible content depending on the subscriber's Sky package. Non-Sky TV customers can access the service by subscribing on a pay-per-view basis.

Sky Go is viewable on up to two devices, with the ability to increase this to four devices with Sky Go Extra for a monthly fee. The now-deprecated Microsoft Silverlight 3.0 browser plug-in is required to play content on computers. Due to viewing rights, certain programmes are not available to watch via Sky Go, and are 'blacked out' from the schedule. To have access to the full selection of live TV channels available on Sky Go, users will need a subscription to the relevant TV packages that correspond to the available channels.


SMPTE 421M, informally known as VC-1, is a video coding format. Most of it was initially developed as the proprietary video format Windows Media Video 9 by Microsoft in 2003. With some enhancements including the development of a new Advanced Profile, it was officially approved as a SMPTE video codec standard on April 3, 2006.

VC-1 is supported in the now deprecated Microsoft Silverlight framework, the now discontinued HD DVD, and in the Blu-ray Disc.


Visifire was a set of data visualization components. It currently supports Charts and Gauges. Visifire is available on Microsoft Silverlight, WPF, Windows Phone, and Windows 8. One can use the same API to create charts and gauges in mobile, web, and desktop environments. Visifire can also be embedded in any webpage as a standalone Silverlight App. It is independent of the server side technology being used. Hence, Visifire can be used with ASP, ASP.NET, PHP, JSP, ColdFusion, Ruby on Rails or just simple HTML with JavaScript. Visifire also has a wizard-driven solution to create charts in SharePoint.

Windows Media Services

Windows Media Services (WMS) is a streaming media server from Microsoft that allows an administrator to generate streaming media (audio/video). Only Windows Media, JPEG, and MP3 formats are supported. WMS is the successor of NetShow Services.In addition to streaming, WMS also has the ability to cache and record streams, enforce authentication, impose various connection limits, restrict access, use multiple protocols, generate usage statistics, and apply forward error correction (FEC). It can also handle a high number of concurrent connections making it suitable for content providers. Streams can also be distributed between servers as part of a distribution network where each server ultimately feeds a different network/audience. Both unicast and multicast streams are supported (multicast streams also use a proprietary and partially encrypted Windows Media Station (*.nsc) file for use by a player.) Typically, Windows Media Player is used to decode and watch/listen to the streams, but other players are also capable of playing unencrypted Windows Media content (Microsoft Silverlight, VLC, MPlayer, etc.)

64-bit versions of Windows Media Services are also available for increased scalability. The Scalable Networking Pack for Windows Server 2003 adds support for network acceleration and hardware-based offloading, which boosts Windows Media server performance. The newest version, Windows Media Services 2008, for Windows Server 2008, includes a built-in WMS Cache/Proxy plug-in which can be used to configure a Windows Media server either as a cache/proxy server or as a reverse proxy server so that it can provide caching and proxy support to other Windows Media servers. Microsoft claims that these offloading technologies nearly double the scalability, making Windows Media Services, according to the claim, the industry's most powerful streaming media server.Windows Media Services 2008 is no longer included with the setup files for the Windows Server 2008 operating system, but is available as a free download. It is also not supported on Windows Server 2012, having been replaced with IIS Media Services.

Windows Presentation Foundation

Windows Presentation Foundation (WPF) is a graphical subsystem by Microsoft for rendering user interfaces in Windows-based applications. WPF, previously known as "Avalon", was initially released as part of .NET Framework 3.0 in 2006. WPF uses DirectX and attempts to provide a consistent programming model for building applications. It separates the user interface from business logic, and resembles similar XML-oriented object models, such as those implemented in XUL and SVG.

WPF employs XAML, an XML-based language, to define and link various interface elements. WPF applications can be deployed as standalone desktop programs or hosted as an embedded object in a website. WPF aims to unify a number of common user interface elements, such as 2D/3D rendering, fixed and adaptive documents, typography, vector graphics, runtime animation, and pre-rendered media. These elements can then be linked and manipulated based on various events, user interactions, and data bindings.

WPF runtime libraries are included with all versions of Microsoft Windows since Windows Vista and Windows Server 2008. Users of Windows XP SP2/SP3 and Windows Server 2003 can optionally install the necessary libraries.Microsoft Silverlight provided functionality that is mostly a subset of WPF to provide embedded web controls comparable to Adobe Flash. 3D runtime rendering had been supported in Silverlight since Silverlight 5.At the Microsoft Connect event on December 4, 2018, Microsoft announced releasing WPF as open source project on GitHub. It is released under the MIT License. Windows Presentation Foundation has become available for projects targeting the .NET Core framework, however, the system is not cross-platform and is still available only on Windows.

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