Check for and enable HTML5 placeholder attribute

jquery.placeholder.js

  $.support.placeholder = ('placeholder' in document.createElement('input'));
  if (!$.support.placeholder) {
    $('input[placeholder],email[placeholder]').each(function() {
      $(this)
        .val($(this).attr('placeholder'))
        .on({
          'focus': function() {
            if ($(this).val() == $(this).attr('placeholder')) $(this).val('');
          },
          'blur': function() {
            if ($(this).val() == '') $(this).val($(this).attr('placeholder'));
          }
        });
    });
  }