There's a typo on the "intro" value "weblit-Navigation" (but it won’t let me comment there for some reason?)

```
Browsers are the software we use the web &ndash; they …
```
- Browsers are the software we use _to explore_ the web?
- Also that dash should be `&mdash;`, and typographically there should not be a space before or after—the kerning table of the font will take care of that whitespace for you.