Ah, I see, awesome.

The ideal behaviour would be to just display the video alone, but
unfortunately, we don't live in a perfect world. What do you think it
would be good to do if there is an error in extraction? What about if
everything seems to work fine from the server's perspective, but the
video is actually unplayable in the browser? It would be disappointing
if there was no way to get to YT from the embed.

I'm not sure how I should design this at the moment.

What's an embedded video? Do you have an example, please?

> It would have been great if there was some kind of pure declarative 
> html
> solution, but I don't plan on blocking JS on bibliogram instances
> anyway, so it doesn't matter.

If JS is disabled, the post is shown on its own, not as an overlay, so 
there's no possibility for focus mixups and things will work fine.

> (Apologies for the address mix up.)

It happens, no worries!

> These links provide a target for accessibility or vimium users to set
> focus on the post overlay image gallery, allowing one to scroll the
> overlay, not the timeline, without a mouse click and scrollwheel or
> touchscreen.

Thanks for the explanation!

Rather than merge this patch right away, I implemented some focus
handling through JavaScript, which is now live on bibliogram.art. Can
you tell me if this solves your problem?

When opening a post, the focus is set to the post overlay. When
closing a post, focus is restored.

Thank you for your work! Patch applied (with a couple of tiny fixes.)

Changing the margin for the fake-checkbox with css, and attributes for 
everything else, sounds great, thanks!

Instead of using classes and CSS for direction, I prefer to use the `dir` 
attribute. You can see that `dir` has been used elsewhere in Bibliogram.

> + direction: ltr

Could you tell me why this is ltr rather than rtl?

Thank you very much for your contribution!

You can see how it looks right now on bibliogram.art. If you want to
make future changes, that's no problem, just send them over in the
same way. :)

Thanks, patch applied. I like your implementation.

Could you give an example of a video fixed by this?