JSFiddle - React, Tailwind, and code Playground

by Comandeer

HTML

<script src="https://cdn.ckeditor.com/4.5.7/basic/ckeditor.js"></script>
<div id="editor1">
	<p>Test <span style="color: rgb( 255, 0, 0 );">remove</span></p>
</div>

JavaScript

CKEDITOR.replace( 'editor1', {
	allowedContent: true,
	toolbar: [
		[ 'TestCmd' ]
	],
	on: {
		configLoaded: function( evt ) {
			evt.editor.ui.addButton( 'TestCmd', {
				label: 'Test',
				command: 'testCmd'
			} );
			
			evt.editor.addCommand( 'testCmd', {
				exec: function( editor, data) {
					var style = new CKEDITOR.style( {
						element: 'span',
						styles: {
							color: '#f00'
						},
						type: CKEDITOR.STYLE_INLINE
					} );
					
					style.remove( editor );
				}
			} )
		}
	}
} );