Element box size on hover
Shows a small tooltip with the width and height of whichever element the cursor is over.
Code to copy
try {
const tip = document.createElement('div');
tip.style.cssText = 'position:fixed;z-index:99999;background:#282828;color:#ebdbb2;'
+ 'font:11px monospace;padding:3px 6px;pointer-events:none;border-radius:3px;display:none;';
document.body.appendChild(tip);
document.addEventListener('mousemove', function (e) {
const el = e.target;
if (!el || el === tip) return;
const r = el.getBoundingClientRect();
tip.textContent = el.tagName.toLowerCase() + ' '
+ Math.round(r.width) + ' x ' + Math.round(r.height);
tip.style.left = (e.clientX + 14) + 'px';
tip.style.top = (e.clientY + 14) + 'px';
tip.style.display = 'block';
});
} catch (err) { console.error('JustZix box dimensions:', 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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