There are ways to test your website for many things. It is not only important for you to know how your clients/customers find you (SEO), but what they use to interpret your treasures. In other words: which browser do they use most, which devices do they log on with, etc.
Most of these links are to the W3C site. If you don’t know, W3C is the group of folks who make the web run as smoothly as possible. They are the ones who set the standards and, from time to time, raise them.
Following are some great free sites that will help you perform a DIY evaluation to find out what, if anything, needs to be done to your site to increase your click-ability.
http://www.webpagetest.org/ allows you to test your site using Internet Explorer or Google Chrome from many different locations around the world. So you can see how quickly your site takes to load.
http://www.xenocode.com/Browsers/ Here you can test your site on many different browsers, even some older versions of IE.
http://www.my-debugbar.com/wiki/IETester/ this site incorporates all versions of IE.
http://validator.w3.org/ is a great way to check out the html code your site and the Internet is built upon.
http://jigsaw.w3.org/css-validator/ is a way to test your CSS code. In short, CSS stands for Cascade Style Sheets; and it handles the styling of your site.
http://freesitevalidator.com/ this site test for HTML validation errors AND it makes sure all of your links work.
http://developer.yahoo.com/yslow/ this evaluation determines what you can do to make your site load faster.
http://validator.w3.org/feed/ if you don’t have an RSS feed, you don’t need to check this one out. But basically it will test your RSS feed that your clients/customers use to keep up to date on your blog, or whatever you have assigned to this feed.
This is only a partial list of free evaluations that you can find online. As you can see to test your site with all of these free evaluations would take a lot of time. So it is important to know your clients, and potential clients, browsing facts. If you need help I also offer a Site Assessment package.