What is Clear html code? Show by diagram

Weird behavior when hit Browser back button in ASP.NET webforms

http://www.west-wind.com/weblog/posts/2007/May/22/__doPostBack-and-the-Back-Button

How to get the checked radio button by jQuery

$(':radio').change(function () {

       $(':radio:checked').each(function () {

            if ($(this).val() == 2) {

                //Do stuff

                return;

            }

        });

    });

How to make a div stay fixed while scroll the page by CSS

style="position:fixed; top: 0%;"

NOT Opx 

How to set focus for first textbox in the web page by jQuery

$("#div1 :input[type='text']:first").focus();