image shall support sizes and "alt" element, but how?

[gnusupport]

How do I include width and height for picture? It is necessary for HTML documents to be valid, please see https://validator.w3.org/

$ cat | djot 
![picture](photo_2022-09-30_14-38-11.jpg)         
<p><img alt="picture" src="photo_2022-09-30_14-38-11.jpg"></p>

[jgm]

Questions should go to Discussions rather than Issues.

[jgm]

djot
![alt text](image.jpg){width="33" height="50"}
<p><img alt="alt text" height="50" src="image.jpg" width="33"></p>