Not directly. JavaScript running in a web page can estimate how many pointer samples the browser passes to the page each second while the mouse moves. That figure is a useful browser-side estimate, but it is not a readout of the mouse’s hardware polling rate.
Why the browser sits between the mouse and your code
A mouse reports its position to the operating system at its own polling rate. The operating system and browser then decide what reaches a web page, and when. A page never sees the raw report stream from the device. It only sees pointer events that the browser has dispatched.
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That gap matters because the browser may merge several pointer changes into one dispatched event. The W3C Pointer Events specification describes this coalescing, and it leaves the details to each browser. In the specification’s words, it “does not define how user agents should coalesce or predict pointer movement data.” Two browsers, or the same browser on two operating systems, can therefore expose different numbers of samples for the same physical movement.
What a page can observe
Dispatched event count
The simplest approach listens for pointermove and counts how many times the handler runs. This is easy to write, but it undercounts whenever the browser has merged several movements into one event. It measures browser dispatch, not mouse reports.
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Coalesced samples with getCoalescedEvents()
The Pointer Events API provides getCoalescedEvents() on a pointer event. It returns the underlying samples that the dispatched event represents, in supporting browsers. Each sample carries its own timestamp, so a test can count the samples the browser exposed rather than the handler calls. This gives a finer estimate, but it still stops at the browser. The browser decides how much of the device’s movement history it keeps.
pointerrawupdate
The pointerrawupdate event is another option for a test to listen for. Whether it fires in a given browser, and how its timing compares with pointermove, depends on the implementation. Check support in the browser you are testing before you rely on it.
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How to run a browser-side estimate
A reasonable test looks like this:
- Open a plain page in the browser you want to test, on a secure origin (HTTPS or localhost), because
getCoalescedEvents()is restricted to secure contexts where it is implemented. - Open the developer console, paste the script below, and press Enter.
- Move the mouse in a continuous, steady motion for the full five seconds. Stopping early or moving in short bursts gives a number that describes the burst, not the device.
- Read the value that appears in the console. Repeat the test two or three times and compare the results before drawing a conclusion.
const samples = [];
const canCoalesce = window.isSecureContext && typeof PointerEvent !== 'undefined' && 'getCoalescedEvents' in PointerEvent.prototype;
document.addEventListener('pointermove', (event) => {
const list = canCoalesce ? event.getCoalescedEvents() : [event];
for (const s of list) samples.push(s.timeStamp);
});
setTimeout(() => {
if (samples.length < 2) return console.log('Not enough movement samples');
const seconds = (samples[samples.length - 1] - samples[0]) / 1000;
if (seconds <= 0) return console.log('Timestamps did not advance');
console.log('Browser-exposed samples per second:', ((samples.length - 1) / seconds).toFixed(1));
}, 5000);If the page is not a secure context, or the method is missing, the script falls back to counting dispatched events. That fallback is coarser, and the label on its output should say so.
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A common shortcut is to count requestAnimationFrame() callbacks per second. Do not use that count as a polling rate. According to MDN, animation-frame callbacks generally run at the display’s refresh rate, and most browsers pause them in background tabs and hidden iframes. The number you get reflects the screen’s refresh scheduling, not how often the mouse reports its position.
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Comparing the three ways to count
| Method | What it counts | Suitable for estimating mouse report rate? |
|---|---|---|
Count of pointermove handler calls |
Dispatched events after browser coalescing | Low. Undercounts whenever several movements are merged |
Samples from getCoalescedEvents() |
Underlying samples the browser exposes, each with a timestamp | Best available in-browser estimate, where supported |
Count of requestAnimationFrame() callbacks |
Frame scheduling tied to display refresh | No. Measures display scheduling, and pauses in background tabs |
Reading the result honestly
A number from this kind of test describes what one browser, on one platform, exposed to one page during one movement. Treat it as an observed rate under those conditions. Do not present it as a certified specification for the mouse. The mouse’s own report rate can be checked only through the manufacturer’s specifications or software that reads the device directly, which a web page cannot do.
Expect the result to change with the browser, the operating system, the page’s load during the test, and how you moved the mouse. A result that is much lower than the mouse’s advertised rate is not proof that the mouse is underperforming. It may reflect what the browser chose to expose.
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If the browser exposes samples with timestamps, the same script can also show whether movement arrives in regular intervals or in bursts. Irregular spacing is often more informative than the average.
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- The value is zero or the script reports too few samples: The page did not receive pointer movement. Make sure the page has focus and that the mouse actually moved during the five seconds.
- The value changes a lot between runs: Movement speed and steadiness affect the sample count. Use the same motion each time, or repeat the test several times and compare.
- The value is identical in two browsers on the same machine: The browsers may be exposing the same underlying samples, or one may not support
getCoalescedEvents(). Check the console output to see which path ran. - The test ran in a background tab or hidden frame: Discard the result. Run the page in the foreground window.
The short version is that a browser can tell you how many pointer samples it hands to a page. It cannot tell you how many times the mouse itself reported.
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