Thanks, I had no clue how this trick worked until I saw your link.
Awesome~ Thank you for posting this link. I had understood the use of wide solid borders with a 0 height and width div, but how the angle was being achieved was perplexing. I was imagining borders as solid rectangles that overlap each other at the corners. This has been a revelation! I have discovered an awesome new power. Thanks!
Another thanks! I was scratching my head for a while.