When rendered with the same engine and without making adjustments for the different font metrics, the glyphs that appear in both Arial and Arial Unicode MS appear to be slightly wider, and thus rounder, in Arial Unicode MS. Horizontal text may also appear to have more inter-line spacing in Arial Unicode MS. This is due to larger bounding boxes (Arial Unicode MS needs more room for some of its extended glyphs) and the limitations of renderers, not changes in the glyph shapes. The lack of kerning pairs in Arial Unicode MS may also affect inter-glyph spacing in some renderers (for example the Adobe Flash Player).