Several times I saw people with these icons where their front pages are checked, but subpages often have errors that no one has noticed.
And you can really click on the correct XHTML image (the ones guerda is attached to) and be sent to W3C to say in capital letters: "Validation failed!"
If you want to support the goals of the W3C, then go. Be that as it may, knock yourself out. Get pages valid. You do not even have to report this to visitors. But if you want to communicate this to visitors, then your page would be better - or rather!
You will need to continue to keep an eye on the future as your content changes. If your site is huge or especially dynamic, perhaps this is not possible. It may not be worth the effort.
Chris burt-brown
source share