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Overview:
jQuery SlimScroll is a simple JavaScript plugin (jQuery SlimScroll) which can be integrated with the Drupal field API.

Installation:
Download the module and extract it to the modules directory.

Configuration:
Go to Entity Managed Display section & select the 'Slim Scroll' Formatter for textarea field & configure as you want.

More Details on Options: http://rocha.la/jQuery-slimScroll/

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