I have made an extension to replace <img> tags with <figure> and <picture> tags. This is the expected output:
<picture>
<source ...>
<img ...>
</picture>
Unfortunately, the <source> element has a closing </source> tag. That's invalid HTML. I traced it to this line in the code. The source element is missing from Python Markdown's internal list of empty elements.
The full list of empty elements includes:
<area>
<base>
<br>
<col>
<embed>
<hr>
<img>
<input>
<link>
<meta>
<param> (deprecated)
<source>
<track>
<wbr>
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