Like Wikipedia, when you hover over a link in Quartz, there is a popup of a page preview that you can scroll to see the entire content.
By default, Quartz only fetches previews for pages inside your vault due to [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS). It does this by selecting all HTML elements with the `popover-hint` class. For most pages, this includes the page title, page metadata like words and time to read, tags, and the actual page content.
When [[creating components|creating your own components]], you can include this `popover-hint` class to also include it in the popover.
