HTML5/JS APP Data Storage (IndexedDB or SQLLite)

I am developing a forms app for windows store platform using HTML5/JS. APP needs to store data locally (images, json, generated Pdfs etc) . App would mostly work in offline mode, but on internet connectivity data will be synced with the web server app.

My question is, Is SQLLite an option for me considering this is a HTML5 application on Windows store. I tried searching on MSDN to see the recommended way of using SQLLite in a HTML5/JS windows store app but couldn't find anything.

Second alternative is IndexedDB. Is that a good choice considering the amount of data that is required to be stored here locally