OK, I wanted to check if you already knew a better solution than the one I've crafted before presenting it. Please, if your consider that inappropiate, just tell me and I'll remove this post. I don't want to spam anyone, I really think this tool can save a lot of time to everyone. What I want to present here is W3CLove -- https://www.w3clove.com -- an online tool for validating whole web sites. You just need to enter the main URL of your site and click "validate". In seconds, you'll have a complete report of the errors and warnings found at your site (up to 250 pages), grouped and simplified. I'll appreciate your feedback on this tool, I'm really excited to present it here. Thanks!