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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!

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Try it out on your free dummy site: Click here => <a href="https://demo.tastewp.com/enhanced-text-widget" rel="nofollow ugc">https://tastewp.com/plugins/enhanced-text-widget</a>. 
(this trick works for all plugins in the WP repo – just replace “wordpress” with “tastewp” in the URL)
Note: This is a classic widget type, in order for it to work on the latest version of WordPress you will need <a href="https://wordpress.org/plugins/classic-widgets/" rel="ugc">Classic Widgets</a> plugin installed on your site.
UPDATE: Plugin ownership changed for this plugin. We are currently evaluating possible enhancements for it. Stay tuned! If you have any suggestions yourself, please let us know in the Support Forum.
An enhanced version of the default text widget where you may have Text, HTML, CSS, JavaScript, Flash, Shortcodes and/or PHP as content with linkable widget title.
<h4>Options</h4>
<ul>
<li>Title</li>
<li>Title URL</li>
<li>Widget CSS class</li>
<li>Content supports Text, HTML, CSS, JavaScript, Flash, Shortcodes, and PHP</li>
<li>Option to not display a title</li>
<li>Option to open Title URL in new window</li>
<li>Option to automatically add paragraphs to content</li>
<li>Option to not output before/after_widget/title (bare widget)</li>
</ul>
For questions, please ask in the <a href="https://wordpress.org/support/plugin/enhanced-text-widget/" rel="ugc">support forum</a>
<h4>Support</h4>
Enjoy this plugin? <a href="https://sellcodes.com/5U4SICyc" rel="nofollow ugc">Send a tip to support development</a>.
This plugin is part of the Inisev product family – <a href="https://inisev.com" rel="nofollow ugc">check out our other products</a>.

Enhanced Text Widget

Needed a simple widget to display some custom fields somewhere on my website. So added the relevent PHP and it just works as expected. Easy to use.

Does the job right

This is the best plugin to add PHP via a widget.

I've used and loved this plugin for years!

An enhanced version of the text widget that supports Text, HTML, CSS, JavaScript, Flash, Shortcodes and PHP with linkable widget title.

Post size text changer vs Enhanced Text Widget