In desktop Reddit posts are actually modal dialogs (don't believe me? Open a Reddit post in your desktop browser). I have this bad habit of clicking my mouse on the whitespace of any web page I visit (I guess I am the only one). The Reddit devs, for whatever reason best known to them, have added a click listener on the backdrop of the Reddit post (like I said, the post is a modal dialog). The moment you click it, the post closes to reveal the subreddit homepage that you were on. This has tripped me so many times I have rewired my brain to use my mouse carefully while navigating Reddit. This sort of design anti-pattern is also visible in USA Today. I don't know who first came up with this pattern but it sucks.
Use modal dialogs for what they have to be used for. Don't try to fool the user into thinking it is a page when it is actually a modal dialog.