HTML5 + Visual Studio 2015

Question

Question regarding HTML5 development and VS2015

 I cant find anything on this subject, available in .Net 4.6 actually

Is it possible to develop a HTML5 application in VS2015 that runs effectively as a desktop application - here I mean it will be running upon it's own PC - Question - can this HTML5 application call into the .Net Framework?

 We have a C# Framework that includes a massive amount of relevant reusable code

 

Currently utilized with a winforms application

 

We are looking at a rewrite into VS2015 making the application an HTML 5 application, but we want to access our .Net framework code.