Do you validate you websites?
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I always validate HTML with sites I'm working on, particularly if has been coded by a third party. My reasons for doing so are a careful balance between ensuring spiders can crawl the page without bumping hideous html errors and ensuring a website is accessible on as many devices/browsers.
If the webpage doesn't adhere to standards it could indicate issues with viewing the pages correctly in the myriad of browsers and devices out there. So theres a User Experience issue to consider.
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I am with you on this. Good to check for any issues. Before focusing on SEO, functionality if my main concern.