There is no good reliable way of doing multi line ellipsis only with CSS, and currently hovercards doesn't really do anything about it.

In any case it is a new feature unrelated to the exchars change, so I've splitted it into a followup task for prio, triage and design consideration.

Change 290913 had a related patch set uploaded (by Jhernandez):
Use exchars instead of exsentences for the extract

https://gerrit.wikimedia.org/r/290913

The TextExtracts API is appending an ellipsis to the extract which is visible when the extract is short, e.g. the first example from T115817 is dealt with very neatly:

But the following isn't:

I note that using CSS ellipsis to deal with this has been moved to T136283 but, given the behaviour of TextExtracts, I'm not convinced that it's a new/distinct feature.

Edit

Thoughts?

@phuedx before this patch Page-Previews had no ellipsis treatment at all.

I would consider the behavior of TextExtracts of adding an ellipsis even when there is no more content in the page/first section a bug. What do you think?

@phuedx for example, for this page on staging:

http://reading-web-staging.wmflabs.org/w/api.php?action=query&format=json&prop=extracts&formatversion=2&redirects=true&exintro=true&exchars=525&explaintext=true&titles=Test

TextExtracts is adding ... when the full content of the page is already there.

Seems like a bug in exchars IMO.

@phuedx I can remove the '...' if it is there until we get to do the css ellipsis?

In T135824#2330850, @Jhernandez wrote:

Seems like a bug in exchars IMO.

Agreed.

In T135824#2330872, @Jhernandez wrote:

@phuedx I can remove the '...' if it is there until we get to do the css ellipsis?

+1

@phuedx Fixed in last PS.

Change 290913 merged by jenkins-bot:
Use exchars instead of exsentences for the extract

https://gerrit.wikimedia.org/r/290913

290913: Use exchars instead of exsentences for the extract has been pulled by the staging server.