reading innerHTML of HTML form with VALUE attribute (& its value) of INPUT tags

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That’s because value is a property when the textbox is filled in, not an attribute. This means that .value works fine, but it’s not part of the actual DOM as an attribute (like <input value="...">).

You’d need to set it explicitly:

document.getElementById("html").onclick = function() {
  var elems = document.getElementsByName("ipForm")[0]
    .getElementsByTagName("input");

  for (var i = 0; i < elems.length; i++) {
    // set attribute to property value
    elems[i].setAttribute("value", elems[i].value);
  }

  alert(document.getElementsByName("ipForm")[0].innerHTML);
};
<form name="ipForm">
  UserName : <input type="text" name="userName">
</form>
<button id="html">get innerHTML</button>

View on jsFiddle

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