At this week's TechEd conference, Microsoft announced that they are adding HTML5 support to Visual Studio LightSwitch, the tool intended to simplify the development of custom database-driven business applications.
The Silverlight client will remain the default target for LightSwitch applications. Microsoft says that the current primary focus for HTML5 applications is mobile optimization and touch functionality. A likely scenario would be a full-featured desktop client running on Silverlight, with an HTML5 mobile companion application. LightSwitch allows for these to be built side-by-side in one project.
The LightSwitch HTML5 client is not yet available, but it's expected soon. It will be available for download from the LightSwitch Developer Center.
Olav Maassen, Liz Keogh & Chris Matts Mar 08, 2014