Scroll progress bar
Shows a thin bar at the top of the screen reflecting how far you have scrolled.
Code to copy
var bar = document.createElement('div');
bar.style.cssText = 'position:fixed;top:0;left:0;height:4px;width:0;background:#006870;z-index:99999;transition:width .1s';
document.body.appendChild(bar);
function update() {
var h = document.documentElement.scrollHeight - window.innerHeight;
var pct = h > 0 ? (window.pageYOffset / h) * 100 : 0;
bar.style.width = pct + '%';
}
window.addEventListener('scroll', update);
window.addEventListener('resize', update);
update();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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