MediaWiki:Common.js

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var addExtraButtons = function(){
    mw.toolbar.addButton( {
        imageFile: '//upload.wikimedia.org/wikipedia/en/3/34/Button_hide_comment.png',
        speedTip: 'Comment visible only for editors',
        tagOpen: '<!-- ',
        tagClose: ' -->',
        sampleText: 'Insert comment here',
        imageId: 'button-comment'
    } );
};
 
if( $.inArray( mw.config.get( 'wgAction' ), [ 'edit', 'submit' ] ) !== -1 ) {
    mw.loader.using( 'user.options', function () {
        if ( ! mw.user.options.get( 'usebetatoolbar' ) ) {
            mw.loader.using( 'mediawiki.action.edit', function(){
                $( addExtraButtons );
            } );
        }
    } );
}