pandoc-2.10.1: test/command/5121.md

```
% pandoc -f markdown -t markdown_strict
![My caption](./my-figure.jpg){width=500px}

## Header 2
^D
<figure>
<img src="./my-figure.jpg" width="500" alt="My caption" /><figcaption aria-hidden="true">My caption</figcaption>
</figure>

Header 2
--------
```