Can't load html5 exemples

Can’t load any exemples of html5, neither on chrome nor firefox, I get this kind of screen:

Am I missing something?

are you running a web server? This is mentioned right at the start of

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also when debugging html you should have the debug log window open so you can see any error or warning messages.

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Oh, thanks, it now works with the web server. Sorry for the noob question!