HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scrollHeight bottom</title>
  <style>
    #terms {
      width: 280px;
      height: 130px;
      overflow: auto;
      padding: 8px;
      border: 2px solid #00b4c5;
      border-radius: 6px;
    }
  </style>
</head>
<body>
  <div id="terms">
    <p>Terms paragraph 1</p>
    <p>Terms paragraph 2</p>
    <p>Terms paragraph 3</p>
    <p>Terms paragraph 4</p>
    <p>Terms paragraph 5</p>
    <p>Terms paragraph 6</p>
    <p>Terms paragraph 7</p>
    <p>Terms paragraph 8</p>
  </div>
  <pre id="out"></pre>
  <script>
    function isRead(element) {
      return Math.abs(element.scrollHeight - element.clientHeight - element.scrollTop) <= 1;
    }
    var box = document.getElementById("terms");
    box.scrollTop = box.scrollHeight;
    var lines = [];
    lines.push("scrollTop: " + box.scrollTop);
    lines.push("isRead: " + isRead(box));
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.scrollHeight — scrolled to bottom (Try It)