I have a small question!
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Do you mean you export a HTML5 website? Exported projects don't work until you upload them to a server. If you just want to test it to see how it works, preview it from within Construct 2.
If you just want to test it, you can preview it in Construct 2, but for exporting the final game you must upload it online somewhere. Try Dropbox, it's free and it works well.
Thanks guys, I just signed up to a free web host and it's working now. I think working out how to use a FTP client took longer than making my game.