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facebook-instant-articles

Unsupported element in Slideshow (Facebook Instant Articles)

I have an issue with Facebook Instant Articles validation. For one of my articles this error message pops up:

Slideshow Contains Unsupported Elements: Only image elements can appear in a slideshow. Ensure that slideshow (at /html/body/article/figure[3]) only contains supported elements. Refer to Slideshows under Format Reference in Instant Articles documentation for more information.

Here's the code:

<figure class="op-slideshow">
    <figure>
        <img src="https://www.example.com/image1.jpg">
        <figcaption>Caption1</figcaption>
    </figure>
    <figure>
        <img src="https://www.example.com/image2.jpg">
        <figcaption>Caption2</figcaption>
    </figure>
</figure>

It was generated by the official PHP SDK, and in the example they are using very similar structure. (http://take.ms/nookv) Is this a bug?

Solution

  • I've found the problem. It had nothing to do with the structure. One of the images was a GIF, which as it turns out, isn't supported in a slideshow.