Had an offline discussion on IRC about this:

```
21:14 simong
mrvisser: do you think it would be a good idea if we made the CSS class value that we use to scope  pdf2htmlEX CSS rules available as previews metadata?
If we would do that, then we wouldn't have to expose the previewsId to the UI
and we don't have to retrieve the latest revisions for non-links
I only just realized because of your comment that that is an option as well

21:16 mrvisser
yea, if it's previews metadata that would work
I think that the "previewsId" should not be previews metadata though

21:16 simong
it isn't
*It won't be

21:17 mrvisser
I know, Nico suggested it at the standup and I didn't get a chance to respond, but it's important that it isn't

21:17 simong
we would end up with something like: contentObj.previews = {'pageCount': 42, 'cssSelector': 'c-cam-foo-rev-cam-123'}

21:17 mrvisser
wasn't sure if you were suggesting to go that route
what does the UI do with that CSS selector? does it embed the preview content into a div with that selector?

21:18 simong
yes
There is a UI counterpart to my PR which I might've forgotten to submit -_-

21:19 mrvisser
makes sense. yea putting it into the previews metadata makes sense

21:19 simong
cool, I'll do that first thing tomorrow morning
```