As a web designer you want to reach the largest target audience for your website, you would like your site to work properly in each type of web browsers.
Cross browser testing can be done by using different type of browsers and check your site whether it display the page properly.
If you’re using window, install different type of browsers such as Mozilla 3.*, Safari 5.* and Google Chrome 8.*.
The latest browsers most of them work well when displaying css driven web pages, but you couldn’t tell whether your page works well in IE 6 and IE 7.
Since, windows computers only allow one version of IE to run. If you have IE 8, you couldn’t check how your page works in IE 6 and IE 7.
Download the latest version from site and open the IETester. To check your page, open new tab in IE 5.5, IE 6 , or IE 7 and check your site.
You will know how your site looks like in different type IE versions.