Customizer: How do you add HTML to control labels?
You should use CSS for this. For example: #customize-control-display_about_text label { font-weight: bold; } Enqueue the stylesheet for this at the customize_controls_enqueue_scripts action. If you must use JS to modify a control, then note that I would not advise using jQuery.ready in the other answer. You should instead make use of the Customizer JS API … Read more