gistfile1.txt

var placeholderElems = $('[data-test]');
var placeholderAttr = 'data-test';
var placeholderClass = 'placeholder';

placeholderElems.focus(function() {
  var input = $(this);

  if (input.val() === input.attr(placeholderAttr)) {
    input.val('');
    input.removeClass(placeholderClass);
  }
}).blur(function() {
  var input = $(this);

  if (input.val() === '' || input.val() === input.attr(placeholderAttr)) {
    input.addClass(placeholderClass);
    input.val(input.attr(placeholderAttr));
  }
}).blur();