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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ariaFlowToElements get</title>
</head>
<body>
  <div id="section1" class="section" aria-flowto="section3">
    <h2>Section 1</h2>
    <p>First section in normal flow. Section 3 is alternate flow.</p>
  </div>
  <div id="section2" class="section">
    <h2>Section 2</h2>
    <p>Second section in normal flow.</p>
  </div>
  <div id="section3" class="section" aria-flowto="section1">
    <h2>Section 3</h2>
    <p>Third section in normal flow. Section 1 is alternate flow.</p>
  </div>
  <pre id="out"></pre>
  <script>
    var lines = [];
    if ("ariaFlowToElements" in Element.prototype) {
      document.querySelectorAll(".section").forEach(function (sectionDivElement) {
        lines.push(sectionDivElement.id);
        lines.push(" aria-flowto: " + sectionDivElement.getAttribute("aria-flowto"));
        lines.push(" ariaFlowToElements:");
        (sectionDivElement.ariaFlowToElements || []).forEach(function (elem) {
          lines.push("  id: " + elem.id);
        });
      });
    } else {
      lines.push("ariaFlowToElements not supported by browser");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Element.ariaFlowToElements — MDN get (Try It)