Wikipedia: back-to-top button
Adds a floating round button that, once you scroll down, smoothly returns you to the very top of the page.
Code to copy
// Floating button that scrolls back to the top of the article
(function () {
if (document.getElementById('jz-wik-top')) { return; }
const btn = document.createElement('button');
btn.id = 'jz-wik-top';
btn.textContent = '↑';
btn.title = 'Back to top';
btn.style.cssText = 'position:fixed;bottom:24px;right:24px;width:44px;' +
'height:44px;border-radius:50%;border:none;background:#36c;color:#fff;' +
'font-size:20px;cursor:pointer;z-index:99999;display:none;' +
'box-shadow:0 2px 8px rgba(0,0,0,.3);';
btn.addEventListener('click', function () {
window.scrollTo({ top: 0, behavior: 'smooth' });
});
document.body.appendChild(btn);
window.addEventListener('scroll', function () {
btn.style.display = window.scrollY > 600 ? 'block' : 'none';
}, { passive: true });
})();How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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