Weston Ruter

This plugin is a proof of concept for how comment editing might be added to the Customizer, with edits to comments being staged in changesets along with any other changes made in customziation session. It demonstrates scalable lazy-loading of controls/settings via the REST API. It demonstrates both dynamic settings and dynamic partials.
A new Comments section is added to the Customizer, and when this section is expanded the most recent comments are fetched from the REST API and then are added as textarea controls in the section. A button appears at the bottom of the section for loading subsequent pages of comments.
The comments are listed with the comment author and publish date along with the post it was commented on. Only the comment’s content is currently editable. When you do edit a comment that appears in the preview, then the comment will be previewed with selective refresh after a low-fidelity instant preview.
When you navigate to a post and see the comment list, clicking the “Edit Comment” link in the Customizer preview will cause the comment to be loaded into a new textarea control in the section, and the control will then be focused for editing.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/-LdT8XO3ys8?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>
This is a natural companion to the <a href="https://wordpress.org/plugins/customize-posts/" rel="ugc">Customize Posts</a> feature plugin.

Customize Comments

Edit comments with live preview and bundle edits in Customizer changesets.

Dojo Digital

This plugin adds a textarea to the Customize page that allows theme editors to write, preview, and implement CSS code in real time. 
It also includes a frontend CSS editor window with live preview capability.

Live CSS Preview

Live front-end and Customizer CSS editing powered by native WordPress Additional CSS storage.

Customize Comments vs Live CSS Preview