HTML5 APPLICATIONS DEVELOPMENT MANUAL (2016)
8 - Validating HTML5 Code
An important aspect of debugging and testing is to validate code to ensure it is properly interpreted by browsers.
We can use a validator to test code for inaccuracies and syntax errors.
W3C provides a code validation service for all versions of HTML and CSS at https://validator.w3.org/

Validating a Package
Packaging an app is the process of preparing an app for installation on different devices or systems.
Microsoft provides a free tool called the Windows App Certification Kit for testing local apps. The kit is a type of validator that tests your app on your computer before you attempt to package and publish it to the Windows Store.

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