<Image-free CSS Tooltip Pointers - A Use for Polygonal CSS? ⁄ >

A while back, Tantek Celik released A Study of Regular Polygons, which used a little-known CSS trick to create non-rectangular shapes such as triangles and pentagons with nothing more than an ordinary HTML element. The experiment is very interesting and really cool, but the practical takeaway wasn't immediately clear.

Recently however, we've been working on building the markup for upcoming jQuery UI widgets, we came across a case that prompted us to take another look at the technique. The tooltip widget design, fairly common in websites these days, uses a small triangular "speech bubble" pointer that is typically created quite easily with a background image. However, we wanted to maintain our commitment to keeping our jQuery UI widgets entirely themable, and using an image for that purpose wouldn't fit with the flexibility jQuery UI requires. How to solve this problem without any need for images? That challenge led us to the experimental approach using polygonal CSS, shown below.



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