jquery AMD placeholder plugin

jquery-placeholder.js

define([
        'jquery'
    ], function($) {

        'use strict';

        // extends $.support
        // http://stackoverflow.com/questions/3937818/how-to-test-if-the-browser-supports-the-native-placeholder-attribute
        $.support.placeholder = (function() {
            var input = document.createElement( 'input' );
            return 'placeholder' in input;
        }());

        // placeholder fallback
        (function($, undefined) {
            var pluginName = 'placeholder';

            var Plugin = function($el) {
                this.$el = $el;

                if (!this.$el.attr('placeholder')) { return; }

                this.$el.data('placeholder', this.$el.attr('placeholder'));
                this.$el.attr('value', this.$el.data('placeholder'));
                console.log(this.$el.attr('value'));

                this.$el.on({
                    focus: $.proxy(function() {
                        if (this.$el.attr('value') === this.$el.data( 'placeholder' )) {
                            this.$el.attr('value', '');
                        }
                    }, this),
                    blur: $.proxy(function() {
                        if (this.$el.attr('value') === '') {
                            this.$el.attr('value', this.$el.data('placeholder'));
                        }
                    }, this)
                });
            };

            $.fn[pluginName] = function(options) {
                var $elms = $(this);

                if ($.support.placeholder) {
                    return $elms;
                }

                return $.each($elms, function(index, el) {
                    var $el = $(el);

                    if (!$.data($el, 'plugin-' + pluginName)) {
                        $.data($el, 'plugin-' + pluginName, new Plugin($el));
                    }
                });
            }
        }($));

    }
);