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This plugin allows your blog to change the font size of entries “on the fly”.
Features:
<ul>
<li>Customizable HTML-wrapper to the style of your theme.</li>
<li>Automatic insertion of the plugin code all pages of posts.</li>
</ul>

Post size text changer

Allow your readers to change the font size of article!

Ryan

Create plain text files through WordPress using a custom post type.
This came about because I needed a way to edit a JavaScript file on a blog that’s 
part of a multi site network setup, and I didn’t want to do a child theme for 
just that one blog and keep up with updating the JS through FTP. This way I can 
edit it directly inside of WordPress as I need to without firing up Notepad++ or 
FileZilla.
If you select either CSS or JavaScript as the file type you’ll have the option 
for the plugin to automatically link to the file within your page header, assuming 
your theme supports the wp_head callback. The links are created using either 
 wp_register_script / <code>wp_enqueue_script</code> or <code>wp_enqueue_style</code> / <code>wp_enqueue_style</code>.
And a thank you goes out to Ted Devito for his 
<a href="http://teddevito.com/demos/textarea.html" rel="nofollow ugc">Tabby jQuery plugin</a> that allows 
the capture of tabs inside the edit text area.

Plain Text Custom Post Type

Adds a custom post type for plain text files that can be used for JavaScript or CSS.

Post size text changer vs Plain Text Custom Post Type