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<p>WordPress HTML editor (tinyMCE) treats schema.org attributes like itemscope/itemtype/itemprop as invalid HTML attributes and strips them when you save the post or page content. This plugin alters this behavior and prevent the WordPress HTML editor from removing the schema.org/microdata markup.</p>
<h3>Credits</h3>
<p>@azaozz suggested the solution. See the issue discussion here: https://core.trac.wordpress.org/ticket/27931</p>


Protect schema.org markup in HTML editor

Easy tool to stop HTML editor from removing schema.org/microdata tags from post or page content.

trubine

<p>Simple plugin for adding buttons to the html wp panel of the tinymce editor.</p>
<p>Features:</p>
<ul>
<li>Ease of use</li>
<li>Ability to add any content</li>
<li>Unlimited number of buttons</li>
<li>Support for strings / tags / shortcodes</li>
<li>Ability to add both paired and single shortcodes / tags</li>
</ul>


Easy Tinymce Editor Add Button

Simple plugin for adding buttons to the html wp panel of the tinymce editor. Features: Ease of use Ability to add any content Unlimited number of b …

Protect schema.org markup in HTML editor vs Easy Tinymce Editor Add Button