Microsoft updated the official support document and announced that it will stop supporting Microsoft Silverlight on October 12, 2021. It is a cross-browser, cross-platform plug-in that brings the next generation of .NET Framework-based media experiences and rich interactive applications to the web. It is a multi-platform solution covering multiple environments, supporting Internet Explorer, Chrome and Firefox browsers on Windows platforms, Safari support on macOS systems, and even applications in Windows Phone 7.
“Microsoft Silverlight will reach the end of support on October 12, 2021. Silverlight development framework is currently only supported on Internet Explorer 10 and Internet Explorer 11, with support for Internet Explorer 10 ending on January 31, 2020. There is no longer support for Chrome, Firefox, or any browser using the Mac operating system.”
However, with the browser plug-in gradually transitioning to HTML5, many browsers have stopped supporting Silverlight in recent years. Silverlight has not received major updates for a long time.