MediaWiki:Main Page.js

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const footer = document.querySelector('#footer');
const observer = new IntersectionObserver(entries => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            document.body.classList.add('footer-visible');
        } else {
            document.body.classList.remove('footer-visible');
        }
    });
});

observer.observe(footer);