However, glyphs from different scripts in this font may not appear correctly aligned relative to each other when used with applications that either don’t support the 'BASE' table or that support it but assume that a particular baseline will not vary across scripts. This situation could arise when a developer makes a Unicode font, for example, by combining glyphs from fonts that use different baseline systems. The 'BASE' table allows for different scripts in the font to specify different values for the same baseline tag. Creative shapes, like swirls or other symbols, may not be recognized by users as indicating that a glyph is missing from the font and is not being displayed at that location. notdef glyph be either an empty rectangle, a rectangle with a question mark inside of it, or a rectangle with an “X”. This glyph should not be left without an outline as the user will only see what looks like a space if a glyph is missing and not be aware of the active font’s limitation. notdef glyph is very important for providing the user feedback that a glyph is not found in the font.
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