HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getClientRects loop</title>
  <style>
    .box { width: 160px; border: 1px solid #94a3b8; padding: 10px; margin: 24px; }
    .box span { border: 1px solid #22c55e; }
  </style>
</head>
<body>
  <div class="box">
    <span>Line one wraps here and keeps going on multiple lines</span>
  </div>
  <pre id="out"></pre>
  <script>
    var el = document.querySelector("span");
    var lines = [];
    for (var i = 0; i < el.getClientRects().length; i++) {
      var r = el.getClientRects()[i];
      lines.push("rect " + (i + 1) + ": top=" + Math.round(r.top) + " w=" + Math.round(r.width));
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.getClientRects — loop rects (Try It)