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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaCurrent vs attribute</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var el = document.createElement("a");
    el.href = "/step-2";
    el.textContent = "Step 2";
    el.setAttribute("aria-current", "step");
    document.body.insertBefore(el, document.getElementById("out"));
    el.ariaCurrent = "step";
    document.getElementById("out").textContent = JSON.stringify({
      fromProperty: el.ariaCurrent,
      fromAttribute: el.getAttribute("aria-current"),
      same: el.ariaCurrent === el.getAttribute("aria-current")
    }, null, 2);
  </script>
</body>
</html>

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Element.ariaCurrent — vs attribute (Try It)