120429 2013-08-28 11:08:27 -0700 The end point of canvas arc is incorrect. 2014-04-03 01:37:25 -0700 1 1 1 Unclassified WebKit Canvas 528+ (Nightly build) Unspecified Unspecified RESOLVED INVALID P2 Normal --- 1 dongseong.hwang webkit-unassigned ian krit oldest_to_newest 922108 0 dongseong.hwang 2013-08-28 11:08:27 -0700 Steps to reproduce: Canvas spec defines start point and end point of arc as follows: http://www.w3.org/TR/2dcontext2/#dom-context-2d-arc The points at startAngle and endAngle along this circle's circumference, measured in radians clockwise from the ellipse's semi-major axis, are the start and end points respectively Actual results: When endAngle-startAngle is greater than 2π, the end point is the same to the start point regardless of the end angle. Expected results: End point of arc must be consistent with end angle Blink had the same issue and fixed in https://codereview.chromium.org/18286007/ There is a discussion about it in W3C bugzilla: https://www.w3.org/Bugs/Public/show_bug.cgi?id=23050 951852 1 ian 2013-11-18 16:06:33 -0800 I've updated the spec to say that WebKit's current behaviour is correct. https://www.w3.org/Bugs/Public/show_bug.cgi?id=23050 997083 2 krit 2014-04-03 01:37:25 -0700 Thanks for clarifying Ian.