Font size is computed as a function of the height of the annotation rectangle.

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from pdf reference:
the default appearance string (da) contains graphics state or text state oper-
ators needed establish graphics state parameters, such text size , color,
for displaying fields variable text. operators allowed within text
objects may occur in string (see figure 4.1 on page 197). @ minimum,
string must include tf (text font) operator along 2 operands, font ,
size. specified font value must match resource name in font entry of
default resource dictionary (referenced dr entry of interactive form
dictionary; see table 8.67). 0 value size means font auto-
sized: size computed function of height of annotation rectangle.

--------------
could u please provide mentioned function description

i don't think of users here provide that.

aandi inston


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