User agents may render graphical primitives with different levels of accuracy. This test is aimed at determining how a UA renders thin strokes.
The test file contains a number of vertical and horizontal lines. The stroke width of the vertical lines increase from left to right. The stroke width of the horizontal lines increase from top to bottom.
The test is passed if user is able to see a smooth stroke width increment for the vertical and horizontal lines. The top left hand corner should contain strokes that are very thin in width and the bottom right hand corner should contain thick strokes.