MediaWiki:Timeless.js

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mw.loader.using(['mediawiki.api']).then(function() {
    var sidebar = $(".mw-body"); // Target right-side panel
    var categoryPage = mw.util.getUrl("MediaWiki:CategorySidebar");
    var $menu = $("<div>").addClass("mw-portlet").attr("id", "custom-category-menu");
    var $heading = $("<h3>").text("Category Pages");
    var $link = $("<a>").attr("href", categoryPage).text("View All Pages");

    $menu.append($heading).append($link);
    sidebar.append($menu);
});