MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
console.log("Welcome to simson.net.");

// Load after the page and dependencies are ready
mw.loader.using('mediawiki.util', function () {
    jQuery(document).ready(function () {
        var banner = document.createElement('div');
        banner.id = 'custom-banner';
        banner.innerHTML = 'Hello from custom JS!';
        var content = document.getElementById('content');
        if (content) {
            content.insertBefore(banner, content.firstChild);
        }
    });
});