wadadanet

WYSIWYG(What You See Is What You Get.) HTML5 Editor. 
Plugin which edits a Page directly from a preview screen.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/VVfohIyBaww?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<a href="http://www.coffee-break-designs.com/plugin/word-press/smart-editor/" title="Official site" rel="nofollow ugc">official site</a>.
日本語: 
本当のWYSIWYGエディターです。 
だって、プレビュー画面で編集しているんだもん。 
詳しくは 
<a href="http://www.coffee-break-designs.com/plugin/word-press/smart-editor/" title="Official site" rel="nofollow ugc">official site</a>.
<h3>Arbitrary section</h3>
Since there is no contribution, it cannot develop at all. (TT)

Smart Editor

WYSIWYG(What You See Is What You Get.) HTML5 Editor,

Danny van Kooten

ibericode

Harish Chouhan

<h4>WYSIWYG Widgets or rich text widgets</h4>
This plugin adds so called “Widget Blocks” to your website which you can easily display in your widget areas.
You can create or edit the widget blocks just like you would edit any post or page, with all the default WordPress editing functions enabled. This way, you can use the visual editor that comes with WordPress to format your widgets. You can even use media uploading to insert images and so forth.
Features:
<ul>
<li>Create beautiful widgets without having to write HTML code</li>
<li>Easily insert media into your widget content</li>
<li>Add headings, lists, blockquotes and other HTML elements to your widgets using the WordPress visual editor</li>
<li>Use WP Links dialog to easily link to any of your pages or posts from a widget</li>
<li>Use shortcodes inside your widgets</li>
<li>Translation ready</li>
</ul>
Translators
<ul>
<li>Dutch (nl_NL) – <a href="https://dannyvankooten.com/" rel="nofollow ugc">Danny van Kooten</a></li>
<li>Spanish (es_ES) – <a href="http://webhostinghub.com/" rel="nofollow ugc">Maria Ramos – WebHostingHub</a></li>
<li>Italian (it_IT) – <a href="http://www.dangelos.it/" rel="nofollow ugc">Tiziano D’Angelo – Studio D’Angelo</a></li>
<li>German (de_DE) – <a href="http://atelier.tag-eins.de/" rel="nofollow ugc">Christian Günther</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext PO and MO files</a> to me so that I can bundle it into WYSIWYG Widgets. You can <a href="https://plugins.svn.wordpress.org/wysiwyg-widgets/trunk/languages/wysiwyg-widgets.po" rel="nofollow ugc">download the latest PO file here</a>.
More information
<ul>
<li><a href="https://dannyvankooten.com/wordpress-plugins/wysiwyg-widgets/" rel="nofollow ugc">WYSIWYG Widgets</a></li>
<li>Other <a href="https://dannyvankooten.com/wordpress-plugins/" rel="nofollow ugc">WordPress plugins</a> by the same author</li>
</ul>

Widget Content Blocks

It does what it says and works well.
Great reusable widgets for multiple sidebars in WordPress.

Works well

This is such a great way to create widget content!

Works Wonderfully!

Edit widget content using the default WordPress visual editor and media uploading functionality. Create widgets like you would create posts or pages.

Smart Editor vs Widget Content Blocks