You can create fully integrated HTML reports using ComponentOne’s Active Reports. The difference between this and the LightSwitch HTML reporting solution covered in the article: Creating Reports in LightSwitch HTML Client is the following:

• Active Reports has a HTML5 report viewer that fully integrates into the LightSwitch HTML page (the Microsoft report viewer is shown using dynamic injection of a object tag)
• Active Reports allows you to preview the report while in design time mode (the Microsoft report requires you to run the entire application to see the report)