omg the comments section are directly scraped from this very page.
<span style="font-size: 300px;"><marquee>hello</marquee></span>
I guess rot would be no problem, but the surface would probably liquefy during the day, and freeze at night, turning into a cheese sea (or maybe an under-crust sea beneath frozen-cheese ice crust?) affected by earth-induced tides, and possibly internal tidal heating which liquefies the inside of the moon too.
<img src="kitten.jpg" onerror="alert('meow!')">
:^)
Edit: meh, stupid CSP…
(Yep it worked)
The Algolia index contains the comments encoded as HTML entities, so they should be safe to insert as is, but seems like the page is first converting it back to HTML, which causes the script and span tags to render as HTML instead of text like here on HN.