Customizer UI Experiments


This plugin is an ongoing WordPress core feature-plugin that facilitates testing smaller user-oriented features and changes proposed in core trac tickets. Components are added, modified, and eventually removed as ideas are first proposed, iterated on, and eventually accepted and patch-ified.

Current components included:
* Adaptive width: make the Customizer proportionally larger on very large screens. #32296

If you’re interested in contributing to this project, join the #core-customize or #design channels in WordPress core Slack.


  • Adaptive width component on a ~2100px wide screen.


  1. Take the easy route and install through the WordPress plugin adder OR
  2. Download the .zip file and upload the unzipped folder to the /wp-content/plugins/ directory
  3. Activate the plugin through the ‘Plugins’ menu in WordPress
  4. Visit the Customizer (Appearance -> Customize) to see the proposed changes in action.
  5. Leave feedback on the proposed changes on the relevant trac tickets from the list of components in the plugin description.

Contributors & Developers

“Customizer UI Experiments” is open source software. The following people have contributed to this plugin.



See full details here:


  • Remove the Better Contrast and Focus component (added to WordPress core in version 4.7).


  • Remove the Device Previews component (added to WordPress core in version 4.5).


  • Added the Device Previews component.
  • Added the Better Contrast and Focus component.


  • Initial commit.
  • Includes the adaptive width component.