I can't get an <img> tag to render

The relevant snippit of my multimarkdown goes like:

The search page looks like:

<img src=“https://www.pter.org/prose/content/multi-engine-pp.png" alt="Use the public page" style="border: 1px solid #000; box-shadow: 5px 5px 10px #888;”>
  
Demo of...

Marked shows the <img> url as if it were code, and when I export it as HTML it comes out as code, with the < rendered as <

What am I doing wrong?

I'm going to fall back to using ![](), but I switched to embedding html when it looks better and I'd like to get back to it.

Google suggested using a self-closing <img> tag (<img />, but that did not help.