MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

// MediaWiki:Common.js
if (mw.config.get('wgPageName') === 'Main_Page') {
    const observer = new MutationObserver((mutationsList, observer) => {
        for (const mutation of mutationsList) {
            if (mutation.target.classList.contains('vector-animations-ready')) {
                const btn = document.querySelector('[data-event-name="pinnable-header.vector-toc.unpin"]');
                if (btn) btn.click(); // simulate user clicking "hide"
                observer.disconnect();
                break;
            }
        }
    });
    observer.observe(document.documentElement, {
        attributes: true,
        attributeFilter: ['class']
    });
}