Ah that's nice, thank you. Sorry I mis-rewrote when I tried to correct what was copied from Twitter. It addeded some extraneous "https://" too.

  javascript:if (!location.href.match('ycom')) {location.href='https://news.ycombinator.com'};if (typeof e!=='undefined') e.style.background='#c0c0c0';e=Array.from(document.querySelectorAll('.age%20a:not(.seen)')).sort().at(-1);e.style.background='#ff0';e.classList.add('seen');e.scrollIntoView({behavior:"smooth",block:"center",inline:"nearest"});{}

I see, that {} at the end is intentional, as you described in another comment.

And accessing the variable e before assigning it a value, now I see that probably serves a practical purpose too.