If you want to RUN A STARTUP,
this is the language for you!

Run a startup
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HTML5 apps are built with HTML5, CSS3, and JavaScript. HTML structures a website and also contains data for the website's content, CSS polishes things up with style to make them better looking, and JavaScript libraries take advantage of HTML5 APIs. These three languages are very easy to get started with. 

Learn WHY HTML5 is the best for you