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The mce_css filter provides a method to add custom stylesheets to the TinyMCE editor window.
$mce_css is a comma separated list of stylesheet URIs.
The file can be a .php file, allowing dynamic generation of CSS rules for the content editor.
If you are doing this from within a theme, use add_editor_style() instead.
function plugin_mce_css( $mce_css ) {
if ( ! empty( $mce_css ) )
$mce_css .= ',';
$mce_css .= plugins_url( 'editor.css', __FILE__ );
return $mce_css;
}
add_filter( 'mce_css', 'plugin_mce_css' );
