Currently on codeforces comments, you can see whether you up/downvoted by looking at the up/down arrows next to the comment rating. If you upvoted the comment, the up arrow will be green, and if you downvoted it, the down arrow will be red.

However, for blog posts, the only way to tell is to try to vote a second time and see if an error toast appears at the bottom of your screen. A side effect of this is that you can’t ever undo a vote for a blog post or change it from a downvote to an upvote, for instance, even though you can do these things for comments.

Is there any reason for this behavior? It seems to me like being able to see what you voted for and change your vote if you like is much better than the blog post system. If there isn’t any reason for it, would it be difficult to change the blog system to match the comment system?