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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Force threshold — read</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    if ("WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN" in MouseEvent) {
      lines.push(String(MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN));
      lines.push(typeof MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN);
    } else {
      lines.push("not supported");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN — read value (Try It)