What is the Need Of W3C validations for a Sites.

Hell dear, W3c validation tool specifically use for site analysis just like that check broken link , 404 error and lot more.

Thanks,

Although W3C validation don’t guarantee you rankings, it is a standard for specified machine language, checking web documents, spelling, grammar, syntax, and proofreading.
W3C validation improves,
-Accessibility
-Readability
-Compatible with different browsers and devices
Validating your code against W3C can save you from errors helps SE’s to read your website better.

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