Assertion: font's glyph | /r/HasAspect | an advance width of 0
Facets:
Source sentences:
text: For example, an overstriking glyph will have an advance width of 0 with possibly a negative left side bearing (if it is intended to follow the overstruck glyph), while a space glyph will have a large advance width, even though there is no actual glyph outline for this glyph.