MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
if (!mw.config.get('wgUserName')) {
    const observer = new MutationObserver((mutationsList, observer) => {
        for (const mutation of mutationsList) {
            if (mutation.target.classList.contains('vector-animations-ready')) {
                const button = document.querySelector(
                    '[data-event-name="pinnable-header.vector-main-menu.pin"]'
                );
            if (button) {
                button.click();
            }

            observer.disconnect();
            break;
        }
    }
});

observer.observe(document.documentElement, {
    attributes: true,
    attributeFilter: ['class']
});

}