HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>previousSibling compact</title>
</head>
<body>
  <span id="b0"></span><span id="b1"></span><span id="b2"></span>
  <pre id="out"></pre>
  <script>
    var b1 = document.getElementById("b1");
    var b2 = document.getElementById("b2");
    document.getElementById("out").textContent =
      b1.previousSibling.id + "\n" + b2.previousSibling.id;
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Node.previousSibling — compact HTML (Try It)