Thanks for opening this PR. It's a neat addition, but I'm not sure how useful it is. The slider is not necessarily a good list item, as there is only ever one of them in the Flickity instance.

Anyways, I'll keep this PR open for a bit to see if there's any other interest.
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@desandro My intention was for the slider to be a <ul> or <ol> and have the slider children be <li>s. I agree that the slider wrapper being an <li> would be questionable :)

On a site I'm working on we're displaying trending articles in a Flickity slider. Having the slide wrapper be an <ol> with each slide an <li> would be the ideal HTML. This PR would allow the slider to have HTML like:

<ol class="flickity-slider">
    <li class="trending-post">....</li>
    <li class="trending-post">....</li>
    <li class="trending-post">....</li>
</ol>

ah! right, thanks for clearing that up. Yeah, that semantically makes sense.

Was this ever added as an option to Flickity?

I agree - I would love to see this feature get merged in. I have a component that I am building that has somewhat painted me in a corner as far as needing to use <ul>\<li> as the flickity slider. It would be great to have this additional flexibility!