# perldoc > Font::TTF::Features::Cvar

## NAME
    [Font::TTF::Features::Size](https://www.chedong.com/phpMan.php/perldoc/Font%3A%3ATTF%3A%3AFeatures%3A%3ASize/markdown) - Class for Character Variants Feature Parameters

## DESCRIPTION
    Handles the Feature Parameters valus forCharacter Variants features

## INSTANCE VARIABLES
    INFILE
        The read file handle

    OFFSET
        Location of the file in the input file

    Format
        Table format - set to 0

    UINameID
        The 'name' table name ID that specifies a string (or strings, for multiple languages) for a
        user-interface label for this feature

    TooltipNameID
        The 'name' table name ID for tooltip text for the feature

    SampleTextNameID
        The 'name' table name ID for sample text to illustrate the feature

    NumNamedParms
        The number of named parameters

    FirstNamedParmID
        The 'name' table name ID for the first named parameter

    Characters
        An array holding the unicode values of the characters for which the feature provides glyph
        variants

## METHODS
  $t->read
    Reads the Feature Params

  $t->out($fh)
    Writes the FeatureParams table to the output

  [Font::TTF::Features::Sset](https://www.chedong.com/phpMan.php/perldoc/Font%3A%3ATTF%3A%3AFeatures%3A%3ASset/markdown)->new()
    Creates a new FeatureParams object. Values for INFILE and OFFSET canbe passed as parameters

## AUTHOR
    David Raymond <<http://scripts.sil.org/FontUtils>>.

## LICENSING
    Copyright (c) 1998-2016, SIL International (<http://www.sil.org>)

    This module is released under the terms of the Artistic License 2.0. For details, see the full
    text of the license in the file LICENSE.