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The purpose of this test is to validate the interaction of x/y glyph positioning and ligatures.
The first line shows an example where there is a ligature (fi) which should be accounted for before breaking into text chunks (see specification section 10.5, additional x/y/dx/dy processing rules, bullet discussing ligatures). In this first line, the ligatures cause the x position 180 (shown in red), to be ignored. As a result, a glyph should be shown over each pale blue square markers. The glyphs are black squares of increasing sizes except for the initial ligature which has the form of two small black triangles joined at their tops. The ligature should show on the first pale blue marker position.
The second line shows the same test but using multiple y positions.
The third line shows the same test but using multiple x and y positions.