Testing Your Website
Although I list this step separately, this should be done throughout your web design cycle. I list it separately to give it a little more prominence, since too few new webmasters actually perform this step adequately.
You will need to test your web pages as you design them in the major browsers: the latest versions of Internet Explorer (version 11 at the time of this writing), Firefox, Opera, Safari and Chrome. All these browsers can be obtained free of charge, so it should be no hardship to get them. Unfortunately, directly testing your site in all these browsers is the only way you can really be sure that it works the way you want it to on your visitors’ machines.
If you want to improve the chances that your website will work in future versions of all web browsers, consider validating the code for your web pages. In layman’s language, this means that you should check that the underlying code of your web page, called “HTML” and “CSS”, has no syntax errors. You don’t actually need technical knowledge of HTML and CSS to validate the page, since you can use one of the numerous free web page validators around to do the hard work. On the other hand, if the validator tells you that your page has errors, it may sometimes be hard to figure out what’s wrong (and whether the error is actually a serious one) if you don’t have the requisite knowledge. Having said that, some validators actually give concrete suggestions on how to fix your code, and one of them, called “HTML Tidy”, is even supposed to be able to fix errors for you.