Validation
Before you launch your site, you should validate your HTML or coding. This is a free service and can be done by the W3C – the organization for establishing web standards.
You can enter your website URI here to validate your site:
Once your page validates, you should do a simple check for broken links. Broken links can hurt your pagerank, so it is best to clean up any broken links as soon as possible.
Broken Link Checker
