MediaWiki:Citizen.js

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/* All JavaScript here will be loaded for users of the Citizen skin */

mw.loader.using( [ 'mediawiki.util', 'mediawiki.ui.icon' ] ).then( function () {
  $( function () {
    var $start = $( '.citizen-header__start' );
    if ( !$start.length ) return;

    var $btn = $( '<a>', {
      id: 'my-header-btn',
      class: 'citizen-header__button',
      href: mw.util.getUrl( 'Special:Random' ),
      title: 'Random page',
      'aria-label': 'Random page'
    }).append(
      $( '<span>', {
        class: 'citizen-ui-icon mw-ui-icon mw-ui-icon-element mw-ui-icon-wikimedia-random'
      } )
    );

    var $hamburger = $start.find( 'button, a' ).first();
    ( $hamburger.length ? $btn.insertAfter( $hamburger ) : $start.prepend( $btn ) );
  } );
} );