Wikipedia: reading progress bar
Adds a thin blue bar at the top of the page that shows how much of the article you have read.
Code to copy
// Show a thin reading-progress bar at the top of the page
(function () {
if (document.getElementById('jz-wik-progress')) { return; }
const bar = document.createElement('div');
bar.id = 'jz-wik-progress';
bar.style.cssText = 'position:fixed;top:0;left:0;height:3px;width:0;' +
'background:#36c;z-index:99999;transition:width .1s ease-out;';
document.body.appendChild(bar);
function update() {
const h = document.documentElement;
const max = h.scrollHeight - h.clientHeight;
const pct = max > 0 ? (h.scrollTop / max) * 100 : 0;
bar.style.width = pct + '%';
}
window.addEventListener('scroll', update, { passive: true });
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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