length-specifier

A length-specifier is a positive or negative value specified along with a unit of measurement without any spaces. The units of measure allowed are "in" for inch, "cm" for centimeter, "mm" for millimeter, and "pt" for points (1/72 inch).

These are some examples of length values.

 

Length value	Description
"1.0in"	1.0 inch
"-3.77cm"	-3.77 cm
"35pt"	35 points (a point is 1/72 inch)
"0pt"	0 points

nonnegative-length-specifier

A nonnegative-length-specifier is a positive value, greater than or equal to zero, specified along with a unit of measurement without any spaces. The format is the same as for length-specifier.

positive-length-specifier

A positive-length-specifier is a positive value, greater than zero, specified along with a unit of measurement without any spaces. The format is the same as for length-specifier.

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