W3C Markup Validator Service: Best Free Tools To Measure Your SEO in 2017

W3C Markup Validator Service – If your markup is outdated, it could be hindering your site’s performance on mobile and notebook devices (which results in you losing traffic). This site allows you to check you markup on HTML, XHTML, and other coding.

Asked on February 4, 2017 in White Hat SEO.
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