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No HTML4 or XHTML1 validation error – SEO

I am using the popular SEO software Brightedge at my company and it is telling me for over 2k+ pages that there is “No HTML4 or XHTML1 validation”. Im not sure what this error means. Hoping someone can help me. I do use the doctype tag in the beginning of every HTML page. I am also using PHP to generate a header template for each page.

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Answers


  1. 0

    This tool might be using w3c validation for your html pages. One of the page’s html (complete) at http://validator.w3.org/ and see what you getting there.

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  2. 0

    This is an important error! It is discovering pages that need to be updated to the latest version of HTML (Currently HTML5). An unlikely error if you are utilizing a common CMS like WordPress, or Shopify, but could be an old custom site or another stack that has not been updated.

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