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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!

minimus

Adds little style sheet file and short code to blog for highlighting some portion of text in a post as colored boxes. 7 styles are available. That may be warning, alert, info and download styled portion of the post’s text.
If you need to explore the source code of plugin, you can find it on <a href="https://github.com/minimus/wp-special-textboxes" rel="nofollow ugc">GitHub</a>.
Available languages:
<ul>
<li>English</li>
<li>Russian</li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send .po and .mo files to me (minimus AT simplelib.com) so that I can bundle it into Special Text Boxes.
Real examples of outputs you can see on the <a href="http://www.simplelib.com/archives/wordpress-plugin-wp-special-textboxes/" rel="nofollow ugc">plugin page</a>
<a href="http://stb.simplelib.com/info/compare-stb/" rel="nofollow ugc">Compare feature set</a> of different editions of the STB plugin and choose exactly what you need.

Special Text Boxes

Highlights any portion of text as text in the colored boxes.

Post size text changer vs Special Text Boxes