Placeholder Cross-Browser with jQuery

/*Downloaded from https://www.codeseek.co/oieduardorabelo/placeholder-cross-browser-with-jquery-umcGj */
'use strict';

App.placeholder = function() {
  if ( ! ('placeholder' in document.createElement('input')) ) {
    var placeholderInputs = $('input[placeholder], textarea[placeholder]');

    $.map(placeholderInputs, function(element) {
      var $element = $(element);
      var placeholder = $element.attr('placeholder');

      element.value = placeholder;

      $element.on('focus', function() {
        if ( this.value === placeholder ) {
          this.value = '';
        }
      });

      $element.on('blur', function() {
        if ( this.value === '' ) {
          this.value = placeholder;
        }
      });
    });
  }
};