Hi Leo,
You most certainly can! DPS2015 supports HTML5 articles.
Using our handy HTML Article Packager, you can simply drag and drop the folder containing the HTML article (HTML/JS/CSS/images/etc), and it'll generate the .article zip file that is ready to be uploaded to the DPS2015 content dashboard!
Note: please make sure that the index.html file is within the root of the folder.
- Mike