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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.

lloan

<p>HTML Page Editor is a custom editor made for developers. It aims to help you write HTML within the Page editor. Simple plugin for a simple task.</p>
<p>Major features in HTML Page Editor include:</p>
<ul>
<li>Code completion ‘Ctrl+Space’</li>
<li>A collection of themes to choose from for the post editor.</li>
<li>Save posts by pressing ‘Ctrl+S’</li>
<li>Cleaner page for creating and editing posts.</li>
<li>Full-screen visual editor for editing and previewing changes in posts. (F11)</li>
</ul>


HTML Page Editor

HTML Page Editor is a custom editor made for developers. It aims to help you write HTML within the Page editor. Simple plugin for a simple task.

Protect schema.org markup in HTML editor vs HTML Page Editor