HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>touchstart press</title>
  <style>
    #pad {
      width: 260px; height: 120px; border: 2px solid #333;
      display: flex; align-items: center; justify-content: center;
      touch-action: none; user-select: none; background: #eee;
    }
    #pad.pressed { background: #cfe8ff; outline: 3px solid #06c; }
  </style>
</head>
<body>
  <div id="pad">Press here</div>
  <pre id="out">idle</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");
    function clear() {
      pad.classList.remove("pressed");
    }
    pad.addEventListener("touchstart", function (event) {
      pad.classList.add("pressed");
      var t = event.changedTouches[0];
      out.textContent = t
        ? "start x=" + Math.round(t.clientX) + " y=" + Math.round(t.clientY)
        : "start";
    }, { passive: true });
    pad.addEventListener("touchend", clear);
    pad.addEventListener("touchcancel", clear);
    pad.addEventListener("mousedown", function (event) {
      pad.classList.add("pressed");
      out.textContent =
        "start x=" + Math.round(event.clientX) +
        " y=" + Math.round(event.clientY);
    });
    window.addEventListener("mouseup", clear);
  </script>
</body>
</html>

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Element touchstart — press style (Try It)