I have a scenario in which to open any document in docement library we use office web app. i.e. every document will only be viewed in office web app. Now my work is to implement a custom functionality: When viewing a document in office web app a user should be able to select any section of document content an sholud be able to share that content using hashtagging. Or in other words it can be said that he should be able to save a specific content of the document as share it with others using hash tagging. All this must be done in office web app. We are using sharepoint 2013.

Thanks