Refreshing the page will fetch a new item every time
Examine the source code of the html file, it has all the explanation you need
If you don't want to use jQuery, you don't have to use my css and js files for dispalying the tooltip. Make it your own! The API provides the ready HTML for the tooltip (response.item.tooltip)!!! You just need to style it yourself and make it pop up as tooltip.
In fact, you don't have to use the API response for visualization at all. You could build your own logic of how you create items on your website, you could just use this API's response for baseline
So this is what you asked for in this request:
This is what the API returned