HTML5 application are served from e.g. files/1-2-the-scientific-method-ed8f, i.e. we drop the index.html for convenience in the browser bar.

However, this means that since the URL was originally files/1-2-the-scientific-method-ed8f/index.html, all links to subresources on the HTML page are now broken.

The most recent change on this is #31 / #74

I suspect the simplest solution consist in adding a trailing slash like files/1-2-the-scientific-method-ed8f/