Copy a comment link in an issue, open a new tab, paste it and click enter.

What the website does: Highlights the comment green for 5 seconds but the user has to scroll down in time to actually see it.

What is to be expected: Webpage scrolls down to the comment automatically and the green highlight stays on indefinitely, for a longer period of time or when the user hovers the mouse over it.

Quick video explanation:

Good fool-proof UI experience is what makes a website good