DedeV6/public/static/ckeditor/plugins/imagebase/styles/imagebase.css

[data-cke-caption-hidden] {
	display: none;
}

[data-cke-caption-placeholder]::before {
	display: inline;
	color: rgba( 0, 0, 0, .4 );
	content: attr( data-cke-caption-placeholder );
}