added HTML validation and debugging #110
Merged
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added HTML validation and debugging modules
-> why validate HTML code
-> importance of validation
-> Introduced to W3C validator
-> what is W3C validator
-> why use W3C validators
-> explained how to use W3C online validator
-> explained how to use W3C validator Using the API for Automated Validation
-> explained common errors and how to fix them with Error description and fix of the error
under Issue #53