What is the fine-grained topic of the following text: The app introduces a functionality that saves to disk a self contained copy of the htmlwidget as an html file with your data and specifications you set from the UI, so it can be embedded in webpages, blogposts and online web appendices for academic publications. Only return the topic.
Functionality of an app that saves htmlwidgets as self-contained html file for embedding in webpages and online publications.