Viewport size badge
A fixed corner badge showing the current window width and height, updating live on resize.
Code to copy
try {
const badge = document.createElement('div');
badge.style.cssText = 'position:fixed;right:8px;bottom:8px;z-index:99999;'
+ 'background:#3c3836;color:#fbf1c7;font:12px monospace;padding:4px 8px;'
+ 'border-radius:4px;pointer-events:none;';
document.body.appendChild(badge);
const update = function () {
badge.textContent = window.innerWidth + ' x ' + window.innerHeight;
};
update();
window.addEventListener('resize', update);
} catch (err) { console.error('JustZix viewport badge:', err); }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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