Like this:
You have to run different browsers for testing the web-page. What’s more? You have to run those stupid IE browsers under VirtualBox or some virtual system. Moreover, different detail behaviors of JavaScript/CSS engine drives you crazy, especially IE. You can write the CSS which works correctly with Chrome/FireFox/Opera, unfortunately, the layout will be messed up by IE! Also, you can write some code that runs correctly with IE6/IE8/Chrome/FireFox/Opera, but not with IE7 (jQuery error when aborting an ajax call only in Internet Explorer).
這時候需要淡定啊教練。