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The line width parameter specifies the thickness of the line used to stroke a path. It is a non-negative number expressed in user space units; stroking a path entails painting all points whose perpendicular distance from the path in user space is less than or equal to half the line width.
A line width of 0 denotes the thinnest line that can be rendered at device resolution: 1 device pixel wide. However, some devices cannot reproduce 1-pixel lines, and on high-resolution devices, they are nearly invisible.Since the results of rendering such zero-width lines are device-dependent, their use is not recommended.