Wow, so you ended up making a cool design and it looks perfect on your screen, but it is not complete yet, cause it needs to be checked on various browsers, screen sizes and resolutions. Every time a design is ready we go about testing it extensively on all kinds, so that the design looks universally alike.
This consistency is important, if you are serious about doing professional design work. When we go about asking, many times we face this that users really do not know which browser they are actually viewing the page in, also sometimes it’s difficult for them to judge which versions of browser they are using.

Especially in the current transitional period of going from IE6 to IE7, and FireFox2 to FireFox 3 where there are significant differences between the two browsers, it gets more important for you to make sure that your design works without problem in all kinds.
Most of the times while we are doing this test, If you see a problem in IE6, it is either working on Firefox or Opera. But ideally it is important that you are must initially test your page in Firefox or Opera, as both of these browsers are the most web standards compliant browser and have abundant resources for testing and debugging markup and code. If your code works in either of those, and the page validates in both html and css, then you can be sure that the webpage should work in all other browsers.
You must not miss doing the Browser compatibility test, cause it will let you to lose visitors if your web pages don’t work on all the popular web browsers. Your web pages may be inconsistent on each browser and the visitors would believe that the website is not professional or is buggy, no one blames the browser.
Browser display problems can basically just kill your web pages, and these display differences are caused by a lot of things such as different browser versions, different computer platforms, screen size, browser bugs, HTML errors, and multiple browsers.
Here is a list of few (19) tools below that let you view your site as other visitors do:
Validator.W3.org
This tool checks the markup validity of web documents in HTML, XHTML,etc. It can be used to check the issues in code to make it comply with any standard.
SortSite Professional v1.01
This tool is capable to check accessibility, usability, multi browser compatibility, broken links, legal compliance and search engine guidelines. Really Useful.
Browser Photo
Useful Tool by Netmechanic, it tests your webpage browser compatibility and lets you see how your pages look on different browsers and operating systems. We use it often.
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