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This test validates that the font element's horiz-adv-x is used as the default glyph's advance when there is no glyph advance specified. All fonts have a units-per-em of 1000.
The first row shows a layout with a default adavance of 1000. Glyphs have no advance so the 1000 default should be used.
The second row shows a layout with a default adavance of 2000. Glyphs have no advance so the 2000 default should be used.
The last row shows a layout with a default adavance of 0. Glyphs have a specified advance so the 0 default should be ignored.
Reference blue markers show the expected glyph positions.