Before launching your new website, you should run a thorough test on your site to see whether there are errors. You want to make sure that all the text, graphics, links and HTML codes are correct on your site.
To check HTML code online, you can use a free tool provided by W3C at http://validator.w3.org/. This markup validation service allows you to check the markup of web documents online. It is free and easy to use. What you need to do is just go to their site, choose the validate methods, and validate your document online. For instance, when using validate by URL, you need to put in your web address. If you don’t have a URL yet, you can validate HTML codes by uploading the file or pasting your markup directly on the site. This markup checking tool can be used to validate not only HTML but also other languages such as XHTML, SML, and so on.
If the report returned on http://validator.w3.org/ showed some errors or warnings, you can make changes correspondingly on your site. After making big changes to your site, you can run the markup test again on the same website. After repeating this process several times, you will make your site better for sure.
Besides, HTML Tidy (www.w3.org/People/Raggett/tidy/)is another useful tool for checking HTML codes. You can also find an online version of HTML Tidy at http://infohound.net/tidy/.
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