chromium/chrome/test/data/chromedriver/sensors_test.html

<!DOCTYPE html>
<meta charset="utf-8">
<script>
let sensor;
let readingEventCounter = 0;
let sensorErrorEvent;

function startSensor() {
    sensor = new Accelerometer({frequency: 5});
    sensor.onreading = () => {
        readingEventCounter++;
    };
    sensor.onerror = e => {
        sensorErrorEvent = e;
    }
    sensor.start();
}
</script>