jQuery HTML5 placeholder fix with compability check

placeholder.js

// Released under MIT license: http://www.opensource.org/licenses/mit-license.php


placeholderSupport = ("placeholder" in document.createElement("input"));
    
    if (!placeholderSupport) {
        (function ($) {
            'use strict';
            $(function () {
                $('[placeholder]')
        	        .focus(function () {
        	            var input = $(this);
        	            if (input.val() === input.attr('placeholder')) {
        	                input.val('').removeClass('placeholder');
        	            }
        	        })
        	        .blur(function () {
        	            var input = $(this);
        	            if (input.val() === '' || input.val() === input.attr('placeholder')) {
        	                input.addClass('placeholder').val(input.attr('placeholder'));
        	            }
        	        })
        	        .blur()
        	        .parents('form').submit(function () {
        	            $(this).find('[placeholder]').each(function () {
        	                var input = $(this);
        	                if (input.val() === input.attr('placeholder')) {
        	                    input.val('');
        	                }
        	            });
        	        });
            });
        })(jQuery);   
    }