Cross-browser placeholder support, a modified version of Caleb Ogden’s jQuery placeholder

jquery.placeholder.css

.ui-placeholder-wrap {
	position: relative;
	display: block;
	-moz-user-select: -moz-none;
	-khtml-user-select: none;
	-webkit-user-select: none;
	user-select: none;
}
.ui-placeholder {
	position: absolute;
	top: 0;
	left: 0;
	display: inline-block;
	vertical-align: middle;
	overflow: hidden;
	cursor: text;
}

jquery.placeholder.js

(function($){
  $.fn.placeholder = function(){
		return this.each(function(){
			var base = $(this);
			var wrap = $('<span>').addClass('ui-placeholder-wrap');
			
			if(!base.parents('.ui-placeholder-wrap').length){
				var placeholder = $('<span>').addClass('ui-placeholder').on('click.placeholder', function(){
					$(this).siblings('input, textarea').focus();
					$(this).parent().addClass('ui-placeholder-active');
				}).html(base.attr('placeholder'));
				
				base.attr('placeholder', '').wrap(wrap).after(placeholder).on('focus.placeholder focusout.placeholder', function(){
					if($(this).val() == ''){
						$(this).siblings('.ui-placeholder').fadeIn('fast');
					}
					$(this).parent().toggleClass('ui-placeholder-active');
				}).on('keydown.placeholder', function(e){
					e.stopPropagation();
					setTimeout(function(){
						if(base.val() == ''){
							base.siblings('.ui-placeholder').fadeIn(250);
						}else{
							base.siblings('.ui-placeholder').hide();
						}
					}, 50);
				});
				
				if(base.val() !== ''){
					placeholder.hide();
				}
			}
		});
	}
})(jQuery);

jquery.placeholder.min.js

(function(e){e.fn.placeholder=function(){return this.each(function(){var t=e(this);var n=e("<span>").addClass("ui-placeholder-wrap");if(!t.parents(".ui-placeholder-wrap").length){var r=e("<span>").addClass("ui-placeholder").on("click.placeholder",function(){e(this).siblings("input, textarea").focus();e(this).parent().addClass("ui-placeholder-active")}).html(t.attr("placeholder"));t.attr("placeholder","").wrap(n).after(r).on("focus.placeholder focusout.placeholder",function(){if(e(this).val()==""){e(this).siblings(".ui-placeholder").fadeIn("fast")}e(this).parent().toggleClass("ui-placeholder-active")}).on("keydown.placeholder",function(e){e.stopPropagation();setTimeout(function(){if(t.val()==""){t.siblings(".ui-placeholder").fadeIn(250)}else{t.siblings(".ui-placeholder").hide()}},50)});if(t.val()!==""){r.hide()}}})}})(jQuery);