HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getClientRects multiline</title>
  <style>
    .wrap { width: 180px; border: 1px solid #94a3b8; padding: 12px; margin: 24px; }
    .wrap span { border: 1px solid #22c55e; }
  </style>
</head>
<body>
  <div class="wrap">
    <p><span>Paragraph that spans multiple lines when the box is narrow</span></p>
  </div>
  <pre id="out"></pre>
  <script>
    var span = document.querySelector("span");
    var p = document.querySelector("p");
    document.getElementById("out").textContent =
      "span rects: " + span.getClientRects().length + "\n" +
      "p rects: " + p.getClientRects().length;
  </script>
</body>
</html>

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Element.getClientRects — multiline span (Try It)