Jason Coleman

The idea for this plugin came from a presentation at WordCamp Philly 
2011.
Code from these other plugins has served as reference and inspiration, and was sometimes borrowed from:
https://wordpress.org/extend/plugins/disable-visual-editor-wysiwyg/ 
https://wordpress.org/extend/plugins/raw-html/
Plans:
<ul>
<li>Hide the disable option from non-admins.</li>
<li>Possibly remove certain filters from the the_content filter, similar to the Raw HTML or Preserved HTML Editor Markup plugins.</li>
</ul>

Don't Break The Code

Allows admins to disable the Visual editor tab on a per post basis.

Ryujiro Yamamoto

View VisualBlocks in WordPress Visual Editor.
<h4>Support Tag</h4>
p, h1, h2, h3, h4, h5, h6, div, section, article, blockquote, 
address, pre, figure, hgroup, aside, figcaption, ul, ol, dl

TinyMCE VisualBlocks

View VisualBlocks in WordPress Visual Editor.

Don't Break The Code vs TinyMCE VisualBlocks