Re: Content Validation
Just to expand on what Dave Sawyers said above...
Why Validate? Because it's good practice, and the best way to catch all those stupid mistakes that could cause content to not be visible to search engines that a browser's error correction might correct for. Even something as simple as omitting a quote in an element tag could cause a section of content to be skipped by a bot, as the bot may interpret the content as additional attributes of the tag. A web browser on the other hand would see the mistake and try to fix it, hiding the problem from the webmaster, even if you view the SE cache of the page. The only system that would alert you to the missing character would be a validation tool.
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