jQuery Placeholder Attribute Polyfill

gistfile1.js

if (!("placeholder" in document.createElement("input"))) {
  $("input[placeholder]").each(function() {
    var $e = $(this),
        placeholder = $e.attr("placeholder");
    $e.val(placeholder);
    $e.bind("focus blur", function(e) {
      if (e.type === "focus" && $e.val() === placeholder) { $e.val(""); }
      else { if (!$e.val()) { $e.val(placeholder); } }
    });
  }).closest("form").submit(function() {
    var $inputs = $(this).find("input[placeholder]");
    $inputs.each(function() {
      var $i = $(this);
      $i.val() === $i.attr("placeholder") && $i.val("");
    });
  });
}