Results don't show in CSS category

# Bug report

## OS information

I am on Windows 11 22H2 using Firefox Version 139.0.4.

## Steps to reproduce

Go to the site, go to the CSS category, choose any property and look at the Result section (if available).
You can also see if you inspect the example there is only a tag and an empty body tag.

## More resources



## Possible fix

Just add the needed code in the result.

Start by reproducing the issue on the CSS category in Firefox, selecting a property and checking its Result section and inspected example. Compare the displayed example with the expected CSS result. Done means CSS property results render the needed example content instead of only an html tag with an empty body.

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