Since you can't upvote your own questions and answers across Stack Exchange (which of course makes perfect sense), instead of a popup message after clicking the up or down arrows, for clarity and UX reasons--especially for new users--could some combination of the following changes be made?
- Disable--not remove--the up/down arrow links on your own answers
- Gray them out or lighten them to clarify they're not an option
- Add a tooltip (replace the current
titleattribute) to the
div.voteelement (or maybe better, the
a.vote-down-offelements for your answer) that explains that you can't vote for your own posts (the current popup text, "You can't vote for your own post", would work fine)
I know there have been some similar suggestions (e.g. here and here) that want to remove that button area entirely, but I know there's good reason to be able to see the vote total (and later the break down). I think this current suggestion would provide a consistent interface (the buttons are still present), but with a subtle indication that they aren't functional in that context, and an explanation with a simple mouse-over.