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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaRowCount pair</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var table = document.createElement("table");
    table.setAttribute("role", "table");
    table.ariaRowCount = "100";
    table.ariaColCount = "2";
    document.body.insertBefore(table, document.getElementById("out"));
    document.getElementById("out").textContent = JSON.stringify({
      ariaRowCount: table.ariaRowCount,
      ariaColCount: table.ariaColCount
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaRowCount — with colcount (Try It)