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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!

Christina

Victor Font

Brings back the classic WordPress text widget without TinyMCE. This is based on the code from WordPress Ver. 4.7.5
Functionality is exactly the same as the pre-version 4.8 text widget. Additional default functionality includes shortcode execution and custom class filter.
Note: This widget uses PHP namespaces to prevent conflicts with other widgets of a similar nature. PHP namespaces are only supported in PHP Version 5.3.0 and higher. If your site uses a PHP version earlier than 5.3.0, do not install this widget unless your PHP version is upgraded first.

Classic Text Widget

Thanks so much for creating this plugin. The WordPress core team doesn't seem to understand that the appeal of the Text widget was that it was just that, a text widget, not a visual editor. I'm so pissed that now all my text widgets on my clients' sites are defaulting to the Visual Editor view, screwing up code that was never meant to be used in a Visual Editor. It's one of the stupidest things the core team has done in awhile. If they wanted to add that functionality they should have made it a whole new widget, not screwed with all the existing widgets. *sigh* Anyway, this helps a lot. Thanks again!

Total lifesaver, thanks!

I was about to make this exact plugin. Thank you for putting this together. Works perfectly!

Great For HTML

The default text widget broke my shortcodes. Thanks for providing an easily solution!

Lifesaver

The classic pre-WordPress version 4.8 text widget

Post size text changer vs Classic Text Widget