118625 2013-07-12 16:32:18 -0700 [CSS Shapes] zero-dimension shapes should be valid 2014-02-24 11:11:50 -0800 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Unspecified Unspecified RESOLVED WORKSFORME InRadar P2 Normal --- 98664 1 stearns betravis bjonesbe dino webkit-bug-importer zoltan oldest_to_newest 908094 0 stearns 2013-07-12 16:32:18 -0700 Currently, it appears that zero-dimension shapes used in shape-outside and clip-path are deemed invalid and not used. Try a rectangle(0,0,0px,0px) as either a shape-outside or clip-path to see that the float area and clip area remain unchanged. The spec says that negative lengths are invalid, which means that zero should be OK. It should be useful to be able to use a zero-extent clip area in an irising transition. 974374 1 webkit-bug-importer 2014-01-31 11:07:09 -0800 <rdar://problem/15958620> 983957 2 bjonesbe 2014-02-24 11:11:50 -0800 As far as I can tell, this has already been fixed. rectangle() is slated for removal, but your example works just fine in the latest nightly. I also tried: circle(0), ellipse(0), and polygon(0 0), all of which properly gave a zero extent shape.