W3 Validation

Search Engine Optimization ― Why do you validate Html ?All Html needed to be in W3 standard and we have to validate through W3 Validator.How to do W3 validation ?It is very simple just go to W3 validator (validator.w3.org). Here you can put the page in 3 way :-1. Validate by URL2. Validate by File Upload3. Validate by direct inputjust select a option then go to more option. If you want to clean up the errors then tick on clean up Markup with HTML Tidy and Validate error page and click on Check.