Detect if user is climbing stairs from mobile device sensors using only JS and HTML

I am curious if there is a way to detect if a user of a website is climbing up or descending stairs using only html5 and JavaScript and mobile device sensors? I am not sure how a function could interpret accelerometer and orientation data and extrapolate that the user is walking up or down a flight of stairs. The article linked below does show how to get sensor data from the mobile device using JavaScript and HTML, but I am looking for a function that can detect stair climbing. Below is the related question: JavaScript tilt sensor

This is a general question, I don't know where to start for a minimal function example.

When ascending stairs, vertical acceleration (Z-axis) shows a repeating up-down spike pattern every step, usually with increasing Z acceleration.

Descending also shows spikes, but with slightly different force and timing.

Orientation (pitch/roll) may help to determine if the phone is tilted forward while climbing, or downward when descending. HTML:

<script>
window.addEventListener('devicemotion', function(event) {
  const acc = event.accelerationIncludingGravity;
  console.log(`X: ${acc.x}, Y: ${acc.y}, Z: ${acc.z}`);
});
</script>

JS:

let accZHistory = [];

window.addEventListener('devicemotion', function(event) {
  const accZ = event.accelerationIncludingGravity.z;
  accZHistory.push(accZ);
  if (accZHistory.length > 50) accZHistory.shift();

  // Check for repeating peaks (simple peak detection)
  let peaks = 0;
  for (let i = 1; i < accZHistory.length - 1; i++) {
    if (accZHistory[i] > accZHistory[i - 1] && accZHistory[i] > accZHistory[i + 1]) {
      peaks++;
    }
  }

  if (peaks >= 3) {
    console.log("Possible stair movement detected!");
  }
});