isnt rendering in htm

When I have ` ` in htm, it's outputting as literally ` ` in the html.

I've seen some [similar questions for JSX](https://stackoverflow.com/questions/37909134/nbsp-jsx-not-working), but it seems that, even there, the space should render.

Is HTM's not rendering it as a non-breaking space intentional?

Here's a near-simplest case reproduction. Obviously the key is ``render(html`# #`, document.getElementById('root-element'));``. It comes out without a space.

```

Hello, Preact World!



window.render = window.preact.render;
window.html = window.htmPreact.html;

document.addEventListener('DOMContentLoaded', function () {
render(html`# #`, document.getElementById('root-element'));
});

```


(Strangely, if I click "edit html" in Chrome (well, here, Brave), it shows that starts with `&` so, for whatever reason, that `&` is a literal `&` in the render..)


Start with the standalone browser reproduction using render(html`# #`, document.getElementById('root-element')) and the htmPreact.html entry point shown in the issue. Check how the template output reaches the rendered HTML and compare it with the expected non-breaking space behavior. Done means the reproduction displays a non-breaking space rather than the literal entity.

Scritto dal modello di indicizzazione a partire dal testo della issue.