[wpietri]

Trying it on Firefox, I couldn't get anything to happen. Under Chrome, I did see some text come up, but nothing played. I suspect in the latter case it's waiting on Wikipedia resources, but it was hard to tell. I love the idea; perhaps a "please wait" or "buffering" or some similar thing would help?

I also agree that the timelines were backwards from what I expected. If you look at existing timelines, almost everything has earlier dates to the left:

https://www.google.com/search?q=timeline&hs=ijL&channel=fs&s...

[cosmiclattes]

I tested it on firefox & it works, I suspect you tried it on a long article in which case you'll have to wait a bit. I'll add a please wait/buffering as you suggested.