Simple offline web chart (javascript chart) prototype

This is a prototyping project to develop an example proof of concept offline web chart application. We would like to have a very very simple chart that works when offline (when there is no internet access). You can use any javascript charting library of your choice...e.g. plotly, etc The key requirements for this prototype are: 1. Simple javascript based chart - e.g. line chart. Use any demo data. 2. Develop very very simple test site that uses javascript and data in json format 3. Content of site is from json, which gets stored in the client when online 4. Works offline when there's no internet. Uses some form of html5 storage, progressive web app technology or sqlite in browser 5. When online again, retrieves and updates json 6. No server side language should be involved This prototype is just to demonstrate. On successful development, a new project will be opened for the full blown project. Budget is $30. Be competitive in your biddingl