• Image-free CSS Tooltip Pointers - A Use for Polygonal CSS? | Filament Group, Inc., Boston, MA
  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.
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